UFC Fight Night: Rosas Jr. vs. Barcelos

The UFC's loudest prospect meets its quietest wall. On Saturday, September 26, the Meta APEX hosts five bantamweight rounds: Raul "El Niño Problema" Rosas Jr. (12-1, #11, age 21) and his 6.10 takedowns per 15 minutes against Raoni Barcelos (22-5, #13, age 39) and an 88% takedown defense built over fifteen UFC bouts. Norma Dumont (#4) vs. Ailín Pérez (#5) features on the preliminary card. Model lean: Barcelos 57–43. Live on Paramount+ at 8:00 PM ET / 5:00 PM PT.

UFC Vegas Rosas Jr vs Barcelos official poster — Meta APEX, Las Vegas, September 26, 2026
Saturday, September 26, 2026
Las Vegas, Nevada, United States
Meta APEX
⚡ Upcoming Event12 Fights
Main Card: Paramount+
Prelims: Paramount+
Start Time: 8:00 PM ET
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UFC Vegas: The Takedown Machine vs. The 88% Wall

Youth and grappling volume against the sturdiest wall in the building: Raul Rosas Jr. (12-1, 6.10 takedowns per 15) meets Raoni Barcelos (22-5, 88% takedown defense) over five rounds at the APEX. Model lean: Barcelos 57–43.

Co-main: Dumont vs. Pérez📺 Paramount+🕒 8:00 PM ET / 5:00 PM PTFull preview & FAQ ↓

UFC Fight Night: Rosas Jr. vs. Barcelos Fights, Analytics & Predictions

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BetOnline is our preferred reference when available. We show the selected source and implied probability; this is not a guarantee of the best price across all books. Check the capture date before treating an estimated edge as current.

Bantamweight · 5 rounds

How to read these filters

Market differences are not a ranking of best bets. Conviction is editorial; a close matchup does not automatically mean poor data.

Fights shown: 12/12 · Analyses available: 12/12

Main Card

🏆 Main eventEstablished UFC sample (5+ bouts each)7 / 15 UFC boutsCounts follow fighter order. The smaller UFC sample determines the color: under 3 red, 3–4 yellow, 5+ green. Sample size is not a win probability or a measure of analysis quality.
Raul Rosas Jr.

Raul Rosas Jr.

“El Niño Problema”

12-1-0

Bantamweight
5 Rounds

Model estimate

43%VS57%

Tactical key

Rosas's high takedown volume meets Barcelos's recorded 88% takedown defence. The decisive distinction is between stopping the first shot and escaping the whole sequence: Rosas needs repeated entries and attacking positions, while Barcelos needs separation that lets him punish the next approach.

Raul Rosas Jr.

Freshness unverified
Estimated EV
-33.1%
Fair decimal odds
2.33
Reference quote-180 (BetOnline)

Raoni Barcelos

Freshness unverified
Estimated EV
+44.2%
Fair decimal odds
1.75
Reference quote+153 (BetOnline)
Uncertainty & price details Analyst conviction: 6/10

What limits this estimate

  • 6.10 takedowns per fifteen minutes is division-leading and roughly four times benchmark — even 88% defence leaks two to four takedowns across twenty-five minutes, and each one is a round.
  • The highest control-time percentage in UFC bantamweight history at 56.9%, in the APEX, in front of judges who reward it.
  • Eighteen years younger. Barcelos is 39 with twenty-seven professional fights of mileage, and championship rounds have ended better fighters than him for exactly that reason.

Raul Rosas Jr.: Land takedowns at will, early and often. His entire measured advantage lives in Round 1 — +3.8 differential, 45% takedown accuracy, 2:50 of control — against a documented slow starter, and every conversion is worth a round on the cards.

Raoni Barcelos: Stuff the first three entries and make the fourth expensive. 88% takedown defence over 41 attempts that rises to 92% by the third round, against a man whose only other tool lands 1.34 significant strikes per minute.

Raul Rosas Jr.

Reference quote: -180 (BetOnline)

Edge vs no-vig market: -18.9 pp

Freshness unverified

Raoni Barcelos

Reference quote: +153 (BetOnline)

Edge vs no-vig market: +18.9 pp

Freshness unverified

Editorial assessment of the evidence, not a win probability or a calibrated confidence interval.

Read full analysis
⭐ Co-MainEstablished UFC sample (5+ bouts each)12 / 7 UFC boutsCounts follow fighter order. The smaller UFC sample determines the color: under 3 red, 3–4 yellow, 5+ green. Sample size is not a win probability or a measure of analysis quality.
Norma Dumont

Norma Dumont

“The Immortal”

13-3-0

Women's Bantamweight
3 Rounds

Model estimate

46%VS54%
Ailín Pérez

Ailín Pérez

“Fiona”

13-2-0

Tactical key

Pérez needs to turn repeated wrestling entries into attacking positions against Dumont, rather than collect brief takedowns. Their contrasting results against Chiasson make that route worth examining, but a common opponent does not predict this fight; Dumont's hand-fighting and ability to separate remain central.

Norma Dumont

Freshness unverified
Estimated EV
+1.2%
Fair decimal odds
2.17
Reference quote+120 (BetOnline)

Ailín Pérez

Freshness unverified
Estimated EV
-7.4%
Fair decimal odds
1.85
Reference quote-140 (BetOnline)
Uncertainty & price details Analyst conviction: 5/10

What limits this estimate

  • Strength of schedule is not close — a former champion, a title challenger, a perennial top-five and a 25-minute main-event win are a tier above anything on the other résumé.
  • 64% strike defence (#3 in the division) and 2.33 absorbed per minute, against a fighter who lands only 2.88 significant strikes per minute at distance.
  • Dumont is the better third-round fighter — 21.8 landed at 55.2%, Strong Finisher, 132% of R1 — exactly where Pérez's ground share collapses 41 points and her absorbed strikes triple.

Norma Dumont: Sixty-seven inches of range in the middle of a cage she has to be willing to walk forward across. If Pérez is shooting from distance rather than locking hands on the fence, Dumont out-lands her by two rounds and wins a technical decision.

Ailín Pérez: A body lock on the fence inside the first ninety seconds. Three or four landed takedowns and six-plus minutes of control across fifteen minutes wins two rounds on modern scoring, even while losing the strike count.

Norma Dumont

Reference quote: +120 (BetOnline)

Edge vs no-vig market: +2.2 pp

Freshness unverified

Ailín Pérez

Reference quote: -140 (BetOnline)

Edge vs no-vig market: -2.2 pp

Freshness unverified

Editorial assessment of the evidence, not a win probability or a calibrated confidence interval.

Read full analysis
Main CardUFC sample awaiting verification9 / — UFC boutsCounts follow fighter order. The smaller UFC sample determines the color: under 3 red, 3–4 yellow, 5+ green. Sample size is not a win probability or a measure of analysis quality.
Sedriques Dumas

Sedriques Dumas

“The Reaper”

10-5-0

Light Heavyweight
3 Rounds

Model estimate

Not assessed

Luis Hernandez

Luis Hernandez

“The Stache”

8-0-0

Tactical key

Length and a cold UFC sample against an unbeaten finisher with no UFC statistics. No win probability is assigned.

Editorial forecast: No clear lean

Model forecast pending.

Uncertainty & price details

What limits this estimate: A published UFC sample for Hernandez, or a market price at 205, is the point to put a number on this.

  • No UFCStats row for Luis Hernandez is used.
  • Hernandez's 11.14 SLpM, 57% accuracy, 6.32 SApM, 39% defense, 2.49 TD/15 and 2.5 Sub/15 are the supplied career line.
  • Dumas's rates were measured at 185. This bout is at 205.
  • No BetOnline price was verified for Hernandez.

Sedriques Dumas

Insufficient price data
Estimated EV
—
Fair decimal odds
—
Reference quote—
Edge vs no-vig market
—

Luis Hernandez

Insufficient price data
Estimated EV
—
Fair decimal odds
—
Reference quote—
Edge vs no-vig market
—

Quotes older than 48 hours are marked outdated. EV at an old or undated price is a historical calculation, not a current opportunity. Date-only snapshots have no verified capture time.

Read full analysis
Main CardLimited UFC sample (<3 bouts)2 / 0 UFC boutsCounts follow fighter order. The smaller UFC sample determines the color: under 3 red, 3–4 yellow, 5+ green. Sample size is not a win probability or a measure of analysis quality.
Bantamweight
3 Rounds

Model estimate

45%VS55%
Mehemmedeli Osmanli

Mehemmedeli Osmanli

“Ineffable”

12-1-0

Tactical key

Both Akylbek Uulu and Osmanli have submission-heavy records, so the decisive moment may be who secures position after the initial scramble. Osmanli's submission loss makes defensive transitions worth watching, but one result does not prove a recurring weakness or guarantee the same opening here.

Ilimbek Akylbek Uulu

Freshness unverified
Estimated EV
+48.9%
Fair decimal odds
2.22
Reference quote+231 (BetOnline)

Mehemmedeli Osmanli

Freshness unverified
Estimated EV
-25.3%
Fair decimal odds
1.82
Reference quote-279 (BetOnline)
Uncertainty & price details Analyst conviction: 3/10

What limits this estimate

  • Both men are making their UFC debut.
  • No supplied UFC rates, RxR, ranks, complete physical attributes or market odds.
  • Akylbek Uulu's six submission wins attack the method behind Osmanli's only loss.

Ilimbek Akylbek Uulu: Turn the submission mirror into a back-control fight. Six career submissions and consecutive rear-naked chokes attack the method behind Osmanli's only loss.

Mehemmedeli Osmanli: Use the broader recent portfolio. Make Akylbek Uulu defend strikes before grappling, then build toward the Round-2 window that produced three supplied finishes.

Ilimbek Akylbek Uulu

Reference quote: +231 (BetOnline)

Edge vs no-vig market: +15.9 pp

Freshness unverified

Mehemmedeli Osmanli

Reference quote: -279 (BetOnline)

Edge vs no-vig market: -15.9 pp

Freshness unverified

Editorial assessment of the evidence, not a win probability or a calibrated confidence interval.

Read full analysis
Main CardLimited UFC sample (<3 bouts)1 / 0 UFC boutsCounts follow fighter order. The smaller UFC sample determines the color: under 3 red, 3–4 yellow, 5+ green. Sample size is not a win probability or a measure of analysis quality.
Women's Strawweight
3 Rounds

Model estimate

55%VS45%
Melissa Amaya

Melissa Amaya

“La Mamba”

8-0-0

Tactical key

Black's nine decision wins support a route through consistent scoring across three rounds, while Amaya's knockout and submission wins offer ways to disrupt that rhythm. The key is whether Amaya can create decisive exchanges against sustained resistance; neither has a UFC sample to confirm that advantage.

Tina Black

Freshness unverified
Estimated EV
-20.0%
Fair decimal odds
1.82
Reference quote-220 (BetOnline)

Melissa Amaya

Freshness unverified
Estimated EV
+28.3%
Fair decimal odds
2.22
Reference quote+185 (BetOnline)
Uncertainty & price details Analyst conviction: 2/10

What limits this estimate

  • Amaya is undefeated at 8-0 and has finished five wins.
  • Her supplied recent history contains a finish in Round 1, Round 2, and Round 3.
  • Both fighters have zero UFC bouts and no supplied UFC rate or round data.

Tina Black: Turn the debut into repeatable five-minute segments. If the fight reaches the cards without a clean Amaya finishing sequence, Black's nine decision wins and larger professional sample become the best evidence available.

Melissa Amaya: Break the decision rhythm. Amaya has a supplied finish in every round and wins 62.5% of her fights inside the distance; one decisive sequence can make the experience gap irrelevant.

Tina Black

Reference quote: -220 (BetOnline)

Edge vs no-vig market: -11.2 pp

Freshness unverified

Melissa Amaya

Reference quote: +185 (BetOnline)

Edge vs no-vig market: +11.2 pp

Freshness unverified

Editorial assessment of the evidence, not a win probability or a calibrated confidence interval.

Read full analysis

Prelims

PrelimsDeveloping UFC sample (3–4 bouts)4 / 4 UFC boutsCounts follow fighter order. The smaller UFC sample determines the color: under 3 red, 3–4 yellow, 5+ green. Sample size is not a win probability or a measure of analysis quality.
Rinya Nakamura

Rinya Nakamura

“Hybrid”

10-1-0

Bantamweight
3 Rounds

Model estimate

55%VS45%
Brady Hiestand

Brady Hiestand

“Bam Bam”

8-2-0

Tactical key

Nakamura's route is to close distance behind controlled entries and turn his wrestling into top-position offence. Hiestand's reach and submission attacks give him ways to contest the entry and threaten in scrambles. The first takedown matters less than who controls the transition that follows.

Rinya Nakamura

Freshness unverified
Estimated EV
-28.6%
Fair decimal odds
1.82
Reference quote-335 (BetOnline)

Brady Hiestand

Freshness unverified
Estimated EV
+67.8%
Fair decimal odds
2.22
Reference quote+273 (BetOnline)
Uncertainty & price details Analyst conviction: 4/10

What limits this estimate

  • Hiestand has never been stopped — four Octagon bouts, all into the third round, 211 significant strikes absorbed and no finish against him.
  • 4.80 takedowns per fifteen minutes to Nakamura's 2.63; he is the busier wrestler by a wide margin.
  • Three career submissions and the Armfield choke give him the single largest outcome bucket at 22%.

Rinya Nakamura: Close distance, chain takedowns with 82% accuracy, control top position and finish by ground-and-pound or bank damage for a decision.

Brady Hiestand: Use the 71-inch reach to manage space, survive the entries and hunt rear-naked chokes in scrambles — both of his Octagon finishes arrived in the third round.

Rinya Nakamura

Reference quote: -335 (BetOnline)

Edge vs no-vig market: -19.2 pp

Freshness unverified

Brady Hiestand

Reference quote: +273 (BetOnline)

Edge vs no-vig market: +19.2 pp

Freshness unverified

Editorial assessment of the evidence, not a win probability or a calibrated confidence interval.

Read full analysis
PrelimsLimited UFC sample (<3 bouts)8 / 2 UFC boutsCounts follow fighter order. The smaller UFC sample determines the color: under 3 red, 3–4 yellow, 5+ green. Sample size is not a win probability or a measure of analysis quality.
Rodolfo Vieira

Rodolfo Vieira

“The Black Belt Hunter”

11-5-0

Men's Middleweight
3 Rounds

Model estimate

58%VS42%

Tactical key

Vieira lands 3.09 takedowns per 15 minutes, but his recorded 23% conversion meets Bryczek's 85% takedown defence. Vieira needs to chain entries into top position before attacking the submission; Bryczek needs early separation and counters that make each re-entry costly. Limited samples temper that statistical contrast.

Rodolfo Vieira

Freshness unverified
Estimated EV
-2.0%
Fair decimal odds
1.72
Reference quote-145 (BetOnline)

Robert Bryczek

Freshness unverified
Estimated EV
-5.9%
Fair decimal odds
2.38
Reference quote+124 (BetOnline)
Uncertainty & price details Analyst conviction: 5/10

What limits this estimate

  • 2-3 in the last five and on a two-fight skid — the Nickal knockout, then a clean-sweep decision loss to Eric McConico in April 2026.
  • 23% takedown accuracy — multiple entries required against 85% TDDef.
  • Bryczek's Round-3 TKO of Tavares proves late knockout power at UFC level.

Rodolfo Vieira: Chain takedowns, establish top control, and finish by arm-triangle or choke — the Petrosyan template against a striker with 85% takedown defence but zero UFC submission offence.

Robert Bryczek: Manage the two-inch reach edge, sprawl on entries, and land the power combinations that stopped Tavares — especially if the fight is standing past ten minutes.

Rodolfo Vieira

Reference quote: -145 (BetOnline)

Edge vs no-vig market: +1.0 pp

Freshness unverified

Robert Bryczek

Reference quote: +124 (BetOnline)

Edge vs no-vig market: -1.0 pp

Freshness unverified

Editorial assessment of the evidence, not a win probability or a calibrated confidence interval.

Read full analysis
PrelimsLimited UFC sample (<3 bouts)5 / 1 UFC boutsCounts follow fighter order. The smaller UFC sample determines the color: under 3 red, 3–4 yellow, 5+ green. Sample size is not a win probability or a measure of analysis quality.
Rodolfo Bellato

Rodolfo Bellato

“Trator”

13-3-1

Light Heavyweight
3 Rounds

Model estimate

62%VS38%
Christian Edwards

Christian Edwards

“Pain”

8-5-0

Tactical key

Bellato's higher recorded output and accuracy give him a route through sustained attacking exchanges. Edwards needs to control distance and make those entries less efficient. His limited UFC minutes leave uncertainty about the size of the gap, especially if Bellato cannot maintain his preferred pace.

Rodolfo Bellato

Freshness unverified
Estimated EV
-2.6%
Fair decimal odds
1.61
Reference quote-175 (BetOnline)

Christian Edwards

Freshness unverified
Estimated EV
-5.4%
Fair decimal odds
2.63
Reference quote+149 (BetOnline)
Uncertainty & price details Analyst conviction: 5/10

What limits this estimate

  • Bellato is the most-hit light heavyweight in the division — 26th of 26 at 5.86 absorbed per minute — with a 47% striking defence and an 'Average' chin grade, and has won only one of three fights after being dropped.
  • Four career knockouts including a 16-second head kick and a 54-second finish: flash equity that never expires against that defensive profile.
  • Bellato's finishing tools decay — ground-strike share falls from 28.4% to 0.0% by the third round, so reaching minute ten defuses both of his UFC win mechanisms.

Rodolfo Bellato: Strikes get thrown and counted. At established rates he lands roughly 2.2 significant strikes for every one Edwards lands — some 44 more over fifteen minutes — and every takedown entry that comes back at him meets a 94% wall.

Christian Edwards: One clean shot on a 47% striking defence inside the first ten minutes, or fifteen very quiet minutes in which almost nothing is thrown and his 55% defence steals close rounds. There is very little middle ground.

Rodolfo Bellato

Reference quote: -175 (BetOnline)

Edge vs no-vig market: +0.7 pp

Freshness unverified

Christian Edwards

Reference quote: +149 (BetOnline)

Edge vs no-vig market: -0.7 pp

Freshness unverified

Editorial assessment of the evidence, not a win probability or a calibrated confidence interval.

Read full analysis
PrelimsLimited UFC sample (<3 bouts)6 / 1 UFC boutsCounts follow fighter order. The smaller UFC sample determines the color: under 3 red, 3–4 yellow, 5+ green. Sample size is not a win probability or a measure of analysis quality.
Lightweight
3 Rounds

Model estimate

60%VS40%
Josiah Harrell

Josiah Harrell

“The Muscle Hamster”

11-1-0

Tactical key

Brener is a cautious editorial selection at 60–40, with low conviction because Harrell is making 155 for the first time and Harrell's limited UFC sample.

Elves Brener

Freshness unverified
Estimated EV
+26.6%
Fair decimal odds
1.67
Reference quote+111 (BetOnline)

Josiah Harrell

Freshness unverified
Estimated EV
-29.2%
Fair decimal odds
2.50
Reference quote-130 (BetOnline)
Uncertainty & price details Analyst conviction: 3/10

What limits this estimate

  • Scheduled for 3 five-minute rounds at lightweight (155). Harrell is making the weight for the first time, so career rates do not establish how either fighter will perform in this specific booking.
  • The comparison is not adjusted for strength of opposition. Takedown accuracy and division rankings need separate verification. Historical round averages describe different opponents and may come from other divisions.
  • Josiah Harrell has only 1 UFC bout. One opponent or short finish can strongly influence these averages.

Elves Brener: Fight at seventy-two inches for fifteen minutes. If he survives a nervy opening five and starts collecting the lead leg, his output curve and a 12:39 average fight time take the cards from a man with one career decision win.

Josiah Harrell: Close four and a half inches and make it a firefight. Brener has been out-landed in every UFC round he has ever fought and absorbs 5.86 a minute — accumulate on the fence and something breaks.

Elves Brener

Reference quote: +111 (BetOnline)

Edge vs no-vig market: +14.4 pp

Freshness unverified

Josiah Harrell

Reference quote: -130 (BetOnline)

Edge vs no-vig market: -14.4 pp

Freshness unverified

Editorial assessment of the evidence, not a win probability or a calibrated confidence interval.

Read full analysis
PrelimsEstablished UFC sample (5+ bouts each)13 / 17 UFC boutsCounts follow fighter order. The smaller UFC sample determines the color: under 3 red, 3–4 yellow, 5+ green. Sample size is not a win probability or a measure of analysis quality.
Montel Jackson

Montel Jackson

“Quik”

15-4-0

Bantamweight
3 Rounds

Model estimate

62%VS38%

Tactical key

Their first meeting showed that Jackson's striking advantage could be offset by Simón's wrestling. Jackson needs to pair clean combinations with immediate entry defence; Simón needs sustained attacking positions after the takedown. The 2018 result is tactical context, with substantial time for both fighters to have changed.

Montel Jackson

Freshness unverified
Estimated EV
-7.8%
Fair decimal odds
1.61
Reference quote-205 (BetOnline)

Ricky Simón

Freshness unverified
Estimated EV
+3.7%
Fair decimal odds
2.63
Reference quote+173 (BetOnline)
Uncertainty & price details Analyst conviction: 6/10

What limits this estimate

  • He already won this fight, 30-27 twice, while being out-struck 42 to 25 — direct evidence that out-landing Jackson does not beat Jackson.
  • All four of Jackson's career losses share one shape: an opponent who took him down repeatedly and controlled him for minutes. Simón is the most prolific takedown artist on that list.
  • 4.49 takedowns per fifteen (3rd of 72) is three times the division average, and the Barcelos blueprint from five months ago is public: catch the kick, ride the single, mount late, take the back.

Montel Jackson: Fight at seventy-five inches for fifteen minutes and punish every failed entry. Simón misses roughly two of every three shots, and the counter left on a level change is the highest-value strike in the fight.

Ricky Simón: Win Rounds 1 and 2 outright. His takedown rate peaks at 1.31 and 1.43 in exactly those rounds, and Round 3 is his worst frame on every metric he owns.

Montel Jackson

Reference quote: -205 (BetOnline)

Edge vs no-vig market: -2.7 pp

Freshness unverified

Ricky Simón

Reference quote: +173 (BetOnline)

Edge vs no-vig market: +2.7 pp

Freshness unverified

Editorial assessment of the evidence, not a win probability or a calibrated confidence interval.

Read full analysis
PrelimsEstablished UFC sample (5+ bouts each)9 / 9 UFC boutsCounts follow fighter order. The smaller UFC sample determines the color: under 3 red, 3–4 yellow, 5+ green. Sample size is not a win probability or a measure of analysis quality.
John Castañeda

John Castañeda

“Sexi Mexi”

21-8-1

Bantamweight
3 Rounds

Model estimate

66%VS34%
Alatengheili

Alatengheili

“The Mongolian Knight”

17-10-2

Tactical key

Castañeda's stronger recorded striking output and accuracy favour repeated exchanges at range. Alatengheili needs to interrupt that rhythm with pressure or grappling and make Castañeda defend before restarting. Historical round averages describe the pattern to test, not a guaranteed result in each round.

John Castañeda

Freshness unverified
Estimated EV
-14.0%
Fair decimal odds
1.52
Reference quote-330 (BetOnline)

Alatengheili

Freshness unverified
Estimated EV
+25.5%
Fair decimal odds
2.94
Reference quote+269 (BetOnline)
Uncertainty & price details Analyst conviction: 6/10

What limits this estimate

  • "Iron" chin tier — zero knockdowns absorbed in 25 UFC rounds and never finished in the UFC. He removes a large slice of the favourite's finishing equity by default.
  • The Round 3 mechanism genuinely works — four of five UFC decision wins, including a 29-28 sweep while being out-landed 85 to 36.
  • 57% striking defence (15th of 52) aimed squarely at the accuracy that is Castañeda's edge, plus above-division takedown rate and accuracy.

John Castañeda: Out-land him at nearly double the accuracy for as long as the fight lasts, and defend one telegraphed five-minute surge. He does not need a new idea — he needs the one his own round data already describes.

Alatengheili: Get to minute eleven within a round on the cards, then land the takedown. That is the entire plan, it has won him four fights, and it now points directly at a 76% takedown defence.

John Castañeda

Reference quote: -330 (BetOnline)

Edge vs no-vig market: -7.9 pp

Freshness unverified

Alatengheili

Reference quote: +269 (BetOnline)

Edge vs no-vig market: +7.9 pp

Freshness unverified

Editorial assessment of the evidence, not a win probability or a calibrated confidence interval.

Read full analysis
PrelimsEstablished UFC sample (5+ bouts each)5 / 10 UFC boutsCounts follow fighter order. The smaller UFC sample determines the color: under 3 red, 3–4 yellow, 5+ green. Sample size is not a win probability or a measure of analysis quality.
Women's Strawweight
3 Rounds

Model estimate

68%VS32%
Vanessa Demopoulos

Vanessa Demopoulos

“Lil' Monster”

11-8-0

Tactical key

Jauregui's high striking output targets Demopoulos's recorded 41% striking defence. Jauregui needs disciplined combinations and exits to keep that advantage in play; Demopoulos needs to interrupt the pace and force grappling exchanges where sustained striking volume matters less.

Yazmin Jauregui

Freshness unverified
Estimated EV
-24.0%
Fair decimal odds
1.47
Reference quote-850 (BetOnline)

Vanessa Demopoulos

Freshness unverified
Estimated EV
+122.7%
Fair decimal odds
3.13
Reference quote+596 (BetOnline)
Uncertainty & price details Analyst conviction: 6/10

What limits this estimate

  • Zero KO/TKO losses in nineteen professional fights — the finish the statistics scream for has never once happened to her.
  • A 742-day layoff on a reconstructed ACL, in a fighter whose entire style is weight-bearing, planted and leg-kick dependent. This is the largest unknown in the file.
  • Jauregui has been knocked down in three of five UFC first rounds and finished inside Round 1 twice — and 100% of Demopoulos's career submission attempts arrive in Round 1.

Yazmin Jauregui: Fight at 64 inches for fifteen minutes. Out-landing a 41%-striking-defence opponent by roughly two to one requires no cooperation from anybody, and she has never lost a decision.

Vanessa Demopoulos: One scramble in the first five minutes. A knockdown, a follow-up to the mat, and an armbar from guard — exactly the sequence that finished Silvana Gómez Juárez at UFC 270.

Yazmin Jauregui

Reference quote: -850 (BetOnline)

Edge vs no-vig market: -18.2 pp

Freshness unverified

Vanessa Demopoulos

Reference quote: +596 (BetOnline)

Edge vs no-vig market: +18.2 pp

Freshness unverified

Editorial assessment of the evidence, not a win probability or a calibrated confidence interval.

Read full analysis
The Meta APEX in Las Vegas uses the smaller 25-foot cage, which historically compresses distance and favours pressure fighters over out-fighters.

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The full story behind UFC Vegas — the narrative, the card spotlights, the questions everyone asks, and how the model reads thin data.

🥊

The Story

UFC Vegas: The Takedown Machine vs. The 88% Wall

📍 Meta APEX, Las Vegas🗓 Saturday, September 26, 2026📺 Paramount+

This UFC Vegas APEX card is a classic timeline test, and the main event is its purest collision. Raul "El Niño Problema" Rosas Jr. (12-1, #11, age 21) owns 6.10 takedowns per 15 minutes and the highest control-time percentage in UFC bantamweight history (56.9%) — including 16 takedowns on Rob Font, the second-most ever in a UFC bantamweight bout. Across from him, Raoni Barcelos (22-5, #13, age 39) is a five-time Brazilian national freestyle wrestling champion with 88% takedown defense — 5 of 41 attempts conceded across fifteen UFC bouts — and a five-fight win streak. It is youth and grappling volume against the sturdiest wall in the building, with the winner moving inside the bantamweight top ten.

MMA Analytics leans Barcelos 57% / Rosas 43% — five rounds extend Barcelos's documented strong-finisher window (his Round-3 output runs at 161% of his Round 1), and neither man has contested a Round 4 in the UFC. The co-main is a women's bantamweight rankings collision: Norma Dumont (#4, 13-3) versus Ailín Pérez (#5, 13-2) in the women's bantamweight co-main. Mickey Gall is off the card; Sedriques Dumas (10-5) meets unbeaten Luis Hernandez (8-0) at 205 on the main card. Rodolfo Vieira vs. Robert Bryczek is now a middleweight preliminary. Each matchup has a dedicated page.

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What is UFC Fight Night: Rosas Jr. vs. Barcelos?

UFC Fight Night: Rosas Jr. vs. Barcelos is a UFC Vegas Fight Night on Saturday, September 26, 2026 at the Meta APEX in Las Vegas, Nevada — a 12-fight card headlined by a five-round bantamweight main event. Raul "El Niño Problema" Rosas Jr. (12-1, ranked #11, age 21) brings 6.10 takedowns per 15 minutes and the highest control-time percentage in UFC bantamweight history (56.9%) against Raoni Barcelos (22-5, ranked #13, age 39), a five-time Brazilian national freestyle wrestling champion with 88% takedown defense measured over 41 attempts and a five-fight win streak. The co-main is Norma Dumont (#4) vs. Ailín Pérez (#5) at women's bantamweight. Mickey Gall is out; Sedriques Dumas meets Luis Hernandez at light heavyweight on the main card. MMA Analytics leans Barcelos 57% / Rosas 43%. The main card streams on Paramount+ at 8:00 PM ET (5:00 PM PT).

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When is UFC Fight Night: Rosas Jr. vs. Barcelos and what time does it start?

UFC Fight Night: Rosas Jr. vs. Barcelos streams live from the Meta APEX in Las Vegas, Nevada on Saturday, September 26, 2026, with the main card beginning at 8:00 PM ET on Paramount+. Local Las Vegas time is 5:00 PM PT. Viewers in the United Kingdom and Ireland should expect a 1:00 AM BST start on Sunday, Central Europe tunes in at 2:00 AM CEST, and Abu Dhabi runs at 4:00 AM on Sunday. Prelims begin at 5:00 PM ET / 2:00 PM PT, also on Paramount+. All listed times follow the UFC.com listing and remain subject to broadcast changes; the timezone grid on this page covers ET, PT, BST, CEST, and UAE at a glance.

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Who is fighting at UFC Fight Night: Rosas Jr. vs. Barcelos?

Main event, bantamweight, five rounds: Raul Rosas Jr. (12-1, #11) vs. Raoni Barcelos (22-5, #13). Co-main, women's bantamweight: Norma Dumont (13-3, #4) vs. Ailín Pérez (13-2, #5). Main card: Sedriques Dumas (10-5) vs. Luis Hernandez (8-0) at light heavyweight, replacing Mickey Gall; Ilimbek Akylbek Uulu (10-3) vs. Mehemmedeli Osmanli (12-1) at bantamweight; Tina Black, billed on some listings as Valesca Machado (15-4), vs. Melissa Amaya (8-0) at women's strawweight. Prelims: Rinya Nakamura (10-1) vs. Brady Hiestand (8-2) at bantamweight; Rodolfo Vieira (11-5) vs. Robert Bryczek (18-7) at middleweight; Rodolfo Bellato (13-3-1) vs. Christian Edwards (8-5) at light heavyweight; Elves Brener (16-6) vs. Josiah Harrell (11-1) at lightweight; Montel Jackson (15-4, #19) vs. Ricky Simón (22-7-1, #27) at bantamweight; John Castañeda (21-8-1) vs. Alatengheili (17-10-2) at bantamweight; Yazmin Jauregui (11-2) vs. Vanessa Demopoulos (11-8) at women's strawweight.

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Who does the MMA Analytics model favor in Rosas Jr. vs. Barcelos?

MMA Analytics currently favors Raoni Barcelos at approximately 57% win probability versus Raul Rosas Jr. at 43% for the UFC Vegas bantamweight main event. The lean is the matchup's sturdiest defensive wall ( 88% TDD measured over 41 attempts) against the division's highest-volume takedown engine (6.10 TD/15, 56.9% career control). Round-by-round data makes it worse for the 21-year-old: Rosas's landed-minus-absorbed differential runs +3.8 in Round 1 then turns negative, his striking output is the second-lowest in a 79-man division, and he has never fought past fifteen minutes — while Barcelos is a documented strong finisher whose Round-3 output runs at 161% of his Round 1. Neither man has contested a Round 4 in the UFC, so five rounds extend Barcelos's best window. Conviction is capped by an eighteen-year age gap and a 39-year-old who was dropped in Round 1 five months ago. Full fight pages compare these model probabilities to BetOnline odds.

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Is the Rosas Jr. vs. Barcelos main event confirmed?

Yes. Raul Rosas Jr. (#11) vs. Raoni Barcelos (#13) is official as the five-round bantamweight main event at the Meta APEX in Las Vegas. Norma Dumont (#4) vs. Ailín Pérez (#5) is the women's bantamweight co-main. Mickey Gall withdrew; Sedriques Dumas now meets Luis Hernandez (8-0) at light heavyweight on the main card. All twelve fights stream on Paramount+; the card order above reflects the announced bout order and remains subject to change.

📊Analysis Reliability Framework

UFC experience describes the size of the available sample, not the chance of winning. A short UFC record leaves more uncertainty about how a fighter performs against different styles. Opponent quality, recent changes and missing statistics also matter; five bouts alone do not establish that a prediction is well calibrated.

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Limited UFC sample

<3 UFC Bouts

Limited UFC data available. Analysis relies more heavily on external sources and pre-UFC performance patterns.

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Developing UFC sample

3-4 UFC Bouts

Some UFC evidence is available, but a few matchups can strongly influence the averages. Check opponent quality and the limitations in each analysis.

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Established UFC sample

5+ UFC Bouts

More UFC observations are available. This does not guarantee predictive accuracy; changes in opposition, injuries and style can still limit the estimate.

Note: All fights receive thorough analysis regardless of UFC experience levels. Analyst conviction is an editorial assessment, not a measured probability or statistical confidence interval.

Model vs market

Yellow marks our forecast favorite. The comparison shows our win estimate against the probability implied by each quote. Gap is in percentage points (pp), includes bookmaker margin, and is not expected return.

Fighter AWin estimate AMarket / implied AFighter BWin estimate BMarket / implied BModel / market & our read
Raul Rosas Jr.43%-180 (BetOnline)64.3% impliedRaoni BarcelosModel favorite57%+153 (BetOnline)39.5% implied
Win probabilityModelMarketGapRaul Rosas Jr.43%64.3%-21.3 ppRaoni Barcelos57%39.5%+17.5 pp

Our read: We favor Raoni Barcelos. The quoted price also offers a positive gap against our estimate.

Quote dates unverified · recheck prices

Norma Dumont46%+120 (BetOnline)45.5% impliedAilín PérezModel favorite54%-140 (BetOnline)58.3% implied
Win probabilityModelMarketGapNorma Dumont46%45.5%+0.5 ppAilín Pérez54%58.3%-4.3 pp

Our read: We narrowly lean Ailín Pérez. Norma Dumont offers the positive price gap, despite not being our outright pick.

Quote dates unverified · recheck prices

Sedriques Dumas—N/A—Luis Hernandez—N/A—

Matchup under review

A numerical win estimate is not available yet, so we cannot assess the price gap.

Ilimbek Akylbek Uulu45%+231 (BetOnline)30.2% impliedMehemmedeli OsmanliModel favorite55%-279 (BetOnline)73.6% implied
Win probabilityModelMarketGapIlimbek Akylbek Uulu45%30.2%+14.8 ppMehemmedeli Osmanli55%73.6%-18.6 pp

Our read: We narrowly lean Mehemmedeli Osmanli. Ilimbek Akylbek Uulu offers the positive price gap, despite not being our outright pick.

Quote dates unverified · recheck prices

Tina BlackModel favorite55%-220 (BetOnline)68.8% impliedMelissa Amaya45%+185 (BetOnline)35.1% implied
Win probabilityModelMarketGapTina Black55%68.8%-13.8 ppMelissa Amaya45%35.1%+9.9 pp

Our read: We narrowly lean Tina Black. Melissa Amaya offers the positive price gap, despite not being our outright pick.

Quote dates unverified · recheck prices

Rinya NakamuraModel favorite55%-335 (BetOnline)77.0% impliedBrady Hiestand45%+273 (BetOnline)26.8% implied
Win probabilityModelMarketGapRinya Nakamura55%77.0%-22.0 ppBrady Hiestand45%26.8%+18.2 pp

Our read: We narrowly lean Rinya Nakamura. Brady Hiestand offers the positive price gap, despite not being our outright pick.

Quote dates unverified · recheck prices

Rodolfo VieiraModel favorite58%-145 (BetOnline)59.2% impliedRobert Bryczek42%+124 (BetOnline)44.6% implied
Win probabilityModelMarketGapRodolfo Vieira58%59.2%-1.2 ppRobert Bryczek42%44.6%-2.6 pp

Our read: We favor Rodolfo Vieira. Neither quote offers a meaningful positive gap against our estimate.

Quote dates unverified · recheck prices

Rodolfo BellatoModel favorite62%-175 (BetOnline)63.6% impliedChristian Edwards38%+149 (BetOnline)40.2% implied
Win probabilityModelMarketGapRodolfo Bellato62%63.6%-1.6 ppChristian Edwards38%40.2%-2.2 pp

Our read: We favor Rodolfo Bellato. Neither quote offers a meaningful positive gap against our estimate.

Quote dates unverified · recheck prices

Elves BrenerModel favorite60%+111 (BetOnline)47.4% impliedJosiah Harrell40%-130 (BetOnline)56.5% implied
Win probabilityModelMarketGapElves Brener60%47.4%+12.6 ppJosiah Harrell40%56.5%-16.5 pp

Our read: We favor Elves Brener. The quoted price also offers a positive gap against our estimate.

Quote dates unverified · recheck prices

Montel JacksonModel favorite62%-205 (BetOnline)67.2% impliedRicky Simón38%+173 (BetOnline)36.6% implied
Win probabilityModelMarketGapMontel Jackson62%67.2%-5.2 ppRicky Simón38%36.6%+1.4 pp

Our read: We favor Montel Jackson. Ricky Simón offers the positive price gap, despite not being our outright pick.

Quote dates unverified · recheck prices

John CastañedaModel favorite66%-330 (BetOnline)76.7% impliedAlatengheili34%+269 (BetOnline)27.1% implied
Win probabilityModelMarketGapJohn Castañeda66%76.7%-10.7 ppAlatengheili34%27.1%+6.9 pp

Our read: We favor John Castañeda. Alatengheili offers the positive price gap, despite not being our outright pick.

Quote dates unverified · recheck prices

Yazmin JaureguiModel favorite68%-850 (BetOnline)89.5% impliedVanessa Demopoulos32%+596 (BetOnline)14.4% implied
Win probabilityModelMarketGapYazmin Jauregui68%89.5%-21.5 ppVanessa Demopoulos32%14.4%+17.6 pp

Our read: We favor Yazmin Jauregui. Vanessa Demopoulos offers the positive price gap, despite not being our outright pick.

Quote dates unverified · recheck prices

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