Rosas Jr. seals sixth straight win with bizarre fifth-round knockout in first UFC main event

Raul Rosas Jr. claimed a dramatic and unusual fifth-round finish over Raoni Barcelos at UFC Vegas 121 — also known as UFC Fight Night 289 — at the UFC Apex in Las Vegas, winning his first UFC main event and stretching his winning streak to six fights.

The finish came at 1:38 of Round 5 when Rosas Jr. landed an inside trip that sent Barcelos crashing to the canvas. The Brazilian veteran appeared to land on his head during the takedown and was immediately knocked out, prompting medical staff to attend to him inside the cage before he was taken to a local hospital. Paramount Brazil’s Vevy Rodrigues later reported that Barcelos was alert and being checked by doctors.

The fight itself was a competitive, grinding affair across all five rounds. Rosas Jr. (13-1, 7-1 UFC), nicknamed “El Niño Problema”, looked sharper on the feet in the early rounds, showing quicker hands and better footwork. Barcelos (22-6, 11-5 UFC) countered by leaning on his wrestling, repeatedly dragging the action to the canvas and connecting with hooks and short punches in his unorthodox style.

By Round 4, fatigue was visible in both fighters. Barcelos took Rosas Jr.’s back and locked in a body triangle while hunting for a rear-naked choke, but the younger man resisted every submission attempt. Rosas Jr. appeared to find a second wind in the fifth, stuffing takedown attempts before landing the trip that ended the contest.

With the win, Rosas Jr. keeps alive his stated ambition of becoming the youngest champion in UFC history.

In the co-main event, Ailin Perez defeated Norma Dumont by unanimous decision — three scores of 29-28 — in the women’s bantamweight division. The pair had made their mutual dislike clear at the weigh-ins and skipped the pre-fight glove touch, though the bout itself failed to match the pre-fight tension. The win was Perez’s seventh consecutive victory, moving her record to 14-2 (7-1 UFC) and potentially into title contention in the division.

UFC Vegas 121 was a finish-heavy card overall, with nine of its bouts ending before the final bell, including one by disqualification.