Casey O’Neill Secures UFC 331 Victory with Highlight-Reel Armbar

Casey O’Neill secured a first-round victory at UFC 331 on September 19 in Los Angeles, defeating Eduarda Moura via armbar at the 3:22 mark. The finish occurred after O’Neill, fighting from her back, elevated Moura with her legs and transitioned into the submission.

The stoppage earned O’Neill one of two $100,000 Performance of the Night bonuses awarded at the event. Following the bout, she noted that the maneuver was instinctual rather than a pre-planned sequence. The win improved her professional record to 12-2 and marked her second consecutive victory since returning to the sport in 2026.