UFC Vegas 121 Fighters Completed Official Weigh-ins

Athletes in Las Vegas hit the scales on Thursday ahead of the weekend fight card.

Updated on Sept. 25, 2026 in Mixed Martial Arts

UFC Vegas 121 Fighters Completed Official Weigh-ins

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Fighters scheduled for UFC Vegas 121 successfully completed their official weigh-ins in Las Vegas on September 25, 2026. The weigh-in session served as the final step before the upcoming bouts, with all participants securing their spots on the card.

Why it matters

Official weigh-ins are a critical regulatory requirement in professional mixed martial arts to ensure competitive fairness and fighter safety. Successfully hitting the scale is the last hurdle before athletes are cleared to compete in their respective bouts.

Luis Hernandez weighed in at 204 pounds against Sedriques Dumas at 197 pounds, while Raul Rosas Jr. and Raoni Barcelos registered at 136 and 135 pounds, respectively. John Castaneda officially reached the 136-pound limit on his second attempt.

The players

Luis Hernandez

He is a professional mixed martial artist participating in the UFC Vegas 121 event.

Sedriques Dumas

He is a professional mixed martial artist scheduled for competition at UFC Vegas 121.

John Castaneda

He is a professional mixed martial arts competitor who successfully hit his required weight on a second attempt.

The details

Athletes stepped onto the official scale in Las Vegas to verify their weights for the upcoming UFC Vegas 121 event. John Castaneda encountered a brief setback, failing his initial weigh-in before successfully making the 136-pound limit on his second try.

September 25, 2026: Official weigh-ins for UFC Vegas 121 occurred in Las Vegas.

Season Trajectory

These weigh-in results finalize the competitive matchups for UFC Vegas 121, directly setting the stage for the weekend's divisional rankings. A successful weight cut ensures that the integrity of the fight card remains intact as athletes move toward their scheduled bouts.

John Castaneda successfully making weight on his second attempt clears him for his scheduled bout, avoiding a potential disqualification or contract penalty. Meanwhile, the seven-pound weight disparity between Luis Hernandez and Sedriques Dumas will likely influence betting lines and fight strategy.

The takeaway

Fighters should ensure they maintain strict nutrition and hydration protocols in the final days before an event to meet weigh-in requirements. Missing weight can jeopardize a fighter's contract status and the scheduling of the entire bout.