UFC Fight Night: Rosas Jr. vs. Barcelos runs Saturday, September 26, 2026 at the Meta APEX in Las Vegas, an 11-fight card headlined by a ranked bantamweight bout between No. 12 Raul Rosas Jr. and No. 13 Raoni Barcelos. It is the cleanest kind of matchup the rankings produce: two men on five-fight win streaks, one of them 21 years old and the other 39, fighting for the same rung on the ladder. Below the main event sit both Ultimate Fighter 34 finals, a Road to UFC champion in Rinya Nakamura, and on the prelims a women's bantamweight fight between the division's No. 4 and No. 5. Here is the complete card bout by bout, every start time, the main event breakdown, and where the community board stands.
Rosas Jr. vs. Barcelos fight card: who is fighting on September 26
Eleven bouts across two segments, and there are no early prelims on this one. Card as of September 22, and like every UFC card it is not final until the fighters make weight on Friday. The event is also listed as UFC Fight Night 289 and UFC Vegas 121, so all three names point at the same night. One more bout, Mickey Gall vs. Sedriques Dumas at middleweight, has been reported for this event and appears in some prelim listings, but it is not on the UFC's official card as of today, so it is left out of the tables below.
Main card
| Bout | Weight class |
|---|---|
| Raul Rosas Jr. vs. Raoni Barcelos | Bantamweight (main event, five rounds) |
| Rodolfo Vieira vs. Robert Bryczek | Middleweight |
| Brady Hiestand vs. Rinya Nakamura | Bantamweight |
| Mehemmedeli Osmanli vs. Ilimbek Akylbek uulu | Bantamweight (TUF 34 final) |
| Melissa Amaya vs. Valesca Machado | Women's strawweight (TUF 34 final) |
| Josiah Harrell vs. Elves Brener | Lightweight |
Prelims
| Bout | Weight class |
|---|---|
| Rodolfo Bellato vs. Christian Edwards | Light heavyweight |
| Montel Jackson vs. Ricky Simon | Bantamweight |
| John Castaneda vs. Alateng Heili | Bantamweight |
| Norma Dumont vs. Ailin Perez | Women's bantamweight |
| Vanessa Demopoulos vs. Yazmin Jauregui | Women's strawweight |
How to watch UFC Fight Night: Rosas Jr. vs. Barcelos
Event: UFC Fight Night: Rosas Jr. vs. Barcelos (UFC Vegas 121)
Date: Saturday, September 26, 2026
Venue: Meta APEX, Las Vegas, Nevada
Prelims: 5 p.m. ET, 4 p.m. CT, 2 p.m. PT
Main card: 8 p.m. ET, 7 p.m. CT, 5 p.m. PT
Watch: Paramount+ in the United States, both segments
The UFC moved its United States rights to Paramount+ for 2026, and this card streams there on a standard subscription with no pay-per-view fee. The UFC's own event page lists Paramount+ as the only outlet, so plan on the app rather than a channel. At least one listing this week printed a 3 p.m. ET prelim start and a 6 p.m. ET main card, but the UFC's event page has 5 p.m. and 8 p.m. ET, and those are the times to plan around. With six bouts on the main card, the main event walk should land somewhere after 10:30 p.m. ET depending on how many fights end early.
Read the line, then beat it.
Once you can read a price you can spot a bad one. BettorEdge shows real peer-to-peer odds, and they are often better than the book you would get stuck with.
Rosas Jr. vs. Barcelos: the main event breakdown
The billing from the UFC is "streaking bantamweights," and the records back it up. Both men have won five straight. The difference is everything else.
Raul Rosas Jr. is 21 and 6-1 in the UFC, and he became the youngest fighter in UFC history to win five octagon bouts when he beat Vince Morales in March 2025 at 20 years and 5 months. His first three UFC wins were stoppages: a first-round face crank of Jay Perrin, a first-round TKO of Terrence Mitchell, and a rear-naked choke of Ricky Turcios that earned Performance of the Night. His last three have gone the distance, against Aori Qileng, Morales, and veteran contender Rob Font at UFC 326 in March. The Font fight is the one to study. Rosas landed 16 takedowns in three rounds, which the UFC's stat records list as tied for the fourth most in any single UFC bout. His only loss is a 2023 decision against Christian Rodriguez.
Raoni Barcelos (22-5) is 39 and in his eighth year with the promotion, 11-4 in the UFC. His streak is five straight: a rear-naked choke of Cristian Quinonez in February 2024, then four decisions over Payton Talbott, Cody Garbrandt, Ricky Simon and, most recently, Montel Jackson by split decision in April. Talbott sits at No. 11 in the current rankings, one spot above Rosas. The two men who beat Barcelos before the streak started were Umar Nurmagomedov by knockout and Kyler Phillips on the cards, which is a short list of very good fighters.
Rosas's path. Make it the Font fight again. Rosas does not need to out-strike a veteran with Barcelos's timing; he needs to get his hands locked and keep changing the angle of attack for as many rounds as it takes. Pace is his friend. A 21-year-old who can chain attempts all night against a 39-year-old is making a bet that the second half of the fight belongs to him, and five rounds gives that bet more room than three.
Barcelos's path. Make Rosas pay for every entry. Barcelos has spent four straight fights showing he can win rounds against younger, bigger-name opponents. The version of this fight he wins is the one where the early takedowns do not stick, Rosas burns energy on failed shots, and the veteran's cleaner counters pile up on the cards. He has been stopped only twice in 27 professional fights, so the underdog case is a decision case.
Eighteen years separate the two men in the main event. The whole fight is a question of whether Rosas's wrestling volume is a style or a phase, and whether Barcelos can still keep a fight standing for 25 minutes.
Rosas Jr. vs. Barcelos odds: where the community board stands
Straight with you. As of 12:34 p.m. UTC on Tuesday, September 22, the BettorEdge community board had zero priced positions on any bout on this card. All eleven fights are listed. Nobody has posted a live community price on either side yet, which is normal four days out. Peer-to-peer fight liquidity tends to arrive after the weigh-ins clear and the card stops moving.
So no odds are quoted here, and no number from anywhere else is standing in for one. When community prices post, convert before you compare. Run the number through the implied probability calculator and the moneyline calculator, then decide whether your read on the fight beats that percentage. Two-way fight moneylines are where a built-in house margin bites hardest, and the no-vig calculator strips it out of any board you want to measure against.
Where the value sits
The main event lean is Rosas, and the price is the whole question. The BettorEdge read is that Rosas is the right side: the age gap is real, the wrestling volume he showed against Font is the kind that compounds over five rounds, and he has not lost in more than three years. But this is exactly the fight a board overprices. Rosas is the young name everyone knows, and Barcelos is a 39-year-old who has beaten a top-15 contender and a former champion in his last four. A wide price on Rosas asks you to pay for the birth certificate and ignore the streak. The value is in a number that respects both.
The co-main lean is a fight, not a side. Rodolfo Vieira (11-5) is 36, a decorated jiu-jitsu black belt, and has lost three of his last four, including a head-kick knockout against Bo Nickal. Robert Bryczek (18-7, 1-2 UFC) is the striker, with a third-round TKO of Brad Tavares in 2025 before a decision loss to Cameron Rowston in May. It is a pure grappler-against-striker question, and the first takedown attempt will tell you most of what you need to know.
The underdog and method-of-victory angle
The main event is built for the scorecards. Both fighters' last three or more wins went to decision: three straight for Rosas, four straight for Barcelos. That is a recent split, not a career rate, since Rosas finished his first three UFC opponents and Barcelos has 11 finishes on his record. But this is Rosas's first scheduled five-round fight in the UFC, against a man who has been stopped twice in his career. If you have a side, how it ends is a separate question worth pricing on its own. The method of victory guide covers how that market works.
Ailin Perez against Norma Dumont is the best fight on the prelims. This is No. 4 against No. 5 in the women's bantamweight rankings. Perez (13-2) has won five straight, with recent decisions over Macy Chiasson and Karol Rosa. Dumont (13-3) had won four straight, including Irene Aldana and Ketlen Vieira, before a decision loss to Joselyne Edwards in April. Perez beat that same Joselyne Edwards in 2024. A common opponent is never proof, but it is the kind of detail that should keep this one close to even.
Montel Jackson and Ricky Simon share a problem named Barcelos. Both lost to the main event's underdog in their last two fights, Simon by unanimous decision in November and Jackson by split decision in April. Jackson (15-4) comes in off back-to-back split-decision losses, the other to Deiveson Figueiredo. Simon (22-7-1) drew with Adrian Yanez in March. Two veterans who need the win against each other tend to produce a tight fight.
Rinya Nakamura is the prospect to watch. The Road to UFC Season 1 bantamweight winner is 10-1, and his only loss is a decision. He and Brady Hiestand (9-2) were first booked to fight at UFC 298 in February 2024 before Hiestand was hurt, so this matchup is more than two and a half years late.
The TUF finals are the honest unknowns. Osmanli vs. Akylbek uulu and Amaya vs. Machado settle The Ultimate Fighter: Team Cormier vs. Team Bisping, and the tournament bouts that got them here were exhibitions that do not count on a professional record. Community prices on these two tend to be built on less information than anything else on the card.
Back Rosas Jr. vs. Barcelos on BettorEdge
A 21-year-old record-setter against a 39-year-old on a five-fight tear, two Ultimate Fighter titles on the line, and a top-five women's bantamweight fight on the prelims. Get your action on BettorEdge and back your fighter against another real bettor at a community price, with up to $100 available when you verify your ID and no deposit needed.
Tools to check before you back a fighter
Know the math before locking anything in. Turn a price into a true win probability with the implied probability calculator, strip the built-in margin out of any board with the no-vig calculator, and size your payout with the betting calculator. Every announced card sits on the BettorEdge UFC hub, and the UFC betting guide covers how fight moneylines are built.
UFC Fight Night: Rosas Jr. vs. Barcelos FAQ
Who is fighting at UFC Fight Night: Rosas Jr. vs. Barcelos?
Raul Rosas Jr. fights Raoni Barcelos in a five-round bantamweight main event, above a main card of Rodolfo Vieira vs. Robert Bryczek, Brady Hiestand vs. Rinya Nakamura, Mehemmedeli Osmanli vs. Ilimbek Akylbek uulu, Melissa Amaya vs. Valesca Machado, and Josiah Harrell vs. Elves Brener. The prelims are Rodolfo Bellato vs. Christian Edwards, Montel Jackson vs. Ricky Simon, John Castaneda vs. Alateng Heili, Norma Dumont vs. Ailin Perez, and Vanessa Demopoulos vs. Yazmin Jauregui. That is 11 bouts, as of September 22, 2026.
When is UFC Fight Night: Rosas Jr. vs. Barcelos and how can I watch it?
UFC Fight Night: Rosas Jr. vs. Barcelos is Saturday, September 26, 2026 at the Meta APEX in Las Vegas, streaming on Paramount+ in the United States. Prelims start at 5 p.m. ET (2 p.m. PT) and the main card at 8 p.m. ET, 7 p.m. CT and 5 p.m. PT.
Is UFC Vegas 121 the same event as Rosas Jr. vs. Barcelos?
Yes, UFC Vegas 121, UFC Fight Night 289 and UFC Fight Night: Rosas Jr. vs. Barcelos are three names for the same September 26, 2026 card at the Meta APEX. Listings and streaming guides use them interchangeably.
Is Rosas Jr. vs. Barcelos a ranked fight?
Yes, Raul Rosas Jr. is No. 12 and Raoni Barcelos is No. 13 in the UFC's official bantamweight rankings, and both come in on five-fight win streaks. It is not a title fight, but the winner climbs a bantamweight division where Petr Yan holds the belt.
What time is the Rosas Jr. vs. Barcelos main event?
The main card starts at 8 p.m. ET and Rosas Jr. vs. Barcelos is the last of six bouts on it, so the walk typically lands after 10:30 p.m. ET, or after 7:30 p.m. PT. The exact time depends on how many earlier fights end inside the distance.
What are the odds for Rosas Jr. vs. Barcelos?
As of 12:34 p.m. UTC on September 22, 2026, the BettorEdge community board had no priced positions on any bout on this card, so no odds are quoted in this preview. Community fight liquidity typically fills in once weigh-ins clear, so check the live board closer to Saturday rather than trusting a number printed days early.
How do I bet on UFC Fight Night: Rosas Jr. vs. Barcelos?
Pick your fighter and place a moneyline on BettorEdge against another real bettor at a community price rather than a sportsbook's. New users can get up to $100 after verifying their ID, with no deposit needed.
Is betting on BettorEdge legal?
Yes, BettorEdge is a peer-to-peer betting marketplace that is legal across 45+ states, with identity verification built in. You are matched against other people, not a house that profits when you lose.
The bottom line
Rosas Jr. vs. Barcelos is a ranked fight that doubles as an age experiment. Rosas brings the wrestling volume that set a takedown mark against Rob Font, and Barcelos brings a five-fight streak built on beating fighters who were supposed to beat him. Vieira and Bryczek settle a grappler-against-striker question in the co-main, two Ultimate Fighter champions get crowned, Nakamura finally meets Hiestand, and Dumont and Perez fight for position near the top of the women's bantamweight division. Eleven fights, two segments, no early prelims, and a community board that has not spoken yet. Watch the weigh-ins, then watch the prices.
Compare prices before the first prelim
Fight boards move fastest after the weigh-ins and again on fight-day morning. See the live BettorEdge board, back your Rosas Jr. vs. Barcelos pick peer to peer, and grab up to $100 when you verify your ID. Better odds. You keep more.
Read the line, then beat it.
Once you can read a price you can spot a bad one. BettorEdge shows real peer-to-peer odds, and they are often better than the book you would get stuck with.