UFC Vegas 121: Rosas Jr. vs. Barcelos is headlined by a five-round bantamweight showdown between Raul Rosas Jr. and Raoni Barcelos. Check out our UFC Vegas 121 odds series for our Rosas Jr.-Barcelos prediction and pick.
Raul Rosas Jr. (12-1 MMA, 6-1 UFC) enters riding a five-fight win streak, his most recent a unanimous decision over veteran Rob Font at UFC 326 in March 2026. Before that, he outpointed Vince Morales and submitted TUF 29 champion Ricky Turcios via rear-naked choke. Now he faces his toughest test yet as he comes into his fight this weekend against Raoni Barcelos.
Raoni Barcelos (22-5 MMA, 11-4 UFC) rides a five-fight winning streak into Saturday's main event, most recently earning a split-decision nod over Montel Jackson in April 2026. Before that win, the 38-year-old Brazilian veteran outpointed Ricky Simon via unanimous decision and knocked off former champion Cody Garbrandt in June 2025. He faces the surging Raul Rosas Jr. in a five-round main event this weekend.
UFC Vegas 121 Odds, courtesy of DraftKings.
UFC Vegas 121 Odds: Raul Rosas Jr.-Raoni Barcelos Odds
Raul Rosas Jr.: -155
Raoni Barcelos: +130
Over 3.5 rounds: -180
Under 3.5 rounds: +140
Watch sports LIVE with fuboTV (free trial)Why Raul Rosas Jr. Will Win
Raul Rosas Jr.'s biggest advantage is his youth and improving well-roundedness, with the 21-year-old riding a five-fight winning streak that's built his record to 12-1 overall and 6-1 in the UFC. His most recent win over Rob Font showed championship-level composure, going the full five-round distance for the first time in his career.
Barcelos, at 39, is on the wrong side of a significant age gap that stands as one of the largest in UFC history, and while his experience is valuable, that mileage tends to catch up with fighters late in fights. Rosas Jr.'s superior cardio and durability should allow him to press the pace in later rounds when Barcelos historically slows down.
Rosas Jr. also holds a clear finishing advantage on paper, with six submission wins showcasing a dangerous ground game that Barcelos, who's mostly relied on decisions in his current five-fight streak, hasn't consistently had to defend. If Rosas Jr. can find a takedown, his grappling could be the great equalizer against Barcelos's experience.
Given his youth, cardio, and submission threat, look for Rosas Jr. to grind down the veteran late and either finish him on the mat or win a clear decision.
Article Continues BelowWhy Raoni Barcelos Will Win
Raoni Barcelos's biggest advantage is his sheer experience, entering this bout on a five-fight winning streak and holding a 22-5 record with 11 wins across his UFC tenure, compared to Rosas Jr.'s 6-1 UFC mark. That veteran savvy has helped him grind out tough, close decisions against the level of competition he'll face here.
His last two wins came against legitimate UFC talent, edging Montel Jackson via split decision before that dominant unanimous decision win over Ricky Simon, proving he can win rounds against durable, well-rounded opponents. Rosas Jr., despite his hype, has largely built his winning streak against lower-ranked competition and hasn't faced someone with Barcelos's championship-level durability and IQ.
Barcelos also carries real finishing power with eight knockouts on his résumé, a threat that could catch the young Rosas Jr. if he gets careless chasing takedowns. Given the historic age gap in this matchup, Barcelos's experience navigating five-round UFC main events gives him a distinct tactical edge over a fighter who's never had to sustain that pace against a veteran.
With superior experience, proven decision-making under championship rounds, and legitimate knockout power, look for Barcelos to frustrate Rosas Jr.'s grappling attempts and pick up another decision win.
Final Raul Rosas Jr.-Raoni Barcelos Prediction & Pick
This main event pits Raul Rosas Jr.'s youth and grappling upside against Raoni Barcelos's veteran savvy and finishing power. Rosas Jr. enters riding a five-fight winning streak at 12-1 overall, while Barcelos brings his own five-fight streak and a 22-5 record into what's one of the largest age gaps in UFC history.
Expect Rosas Jr. to look for takedowns early, using his improving grappling to neutralize Barcelos's standup and set up his six career submission wins. If he can avoid Barcelos's counters and get this to the mat, his youth and cardio should shine late.
Barcelos, however, has shown he can grind out close decisions against durable competition like Montel Jackson and Ricky Simon, and his 39-year-old legs have proven they can survive five rounds. His experience navigating the later rounds could frustrate the younger fighter's game plan.
Rosas Jr. passes the test with flying colors by decision, using his cardio and grappling pressure to control the later rounds and edge out the veteran on the scorecards.
Final Raul Rosas Jr.-Raoni Barcelos Prediction & Pick: Raul Rosas Jr. (-155), OVER 3.5 Rounds (-180)