Casey O'Neill Defeated Eduarda Moura at UFC 331
Casey O'Neill secured a first-round victory over Eduarda Moura via armbar submission at UFC 331.
Updated on Sept. 19, 2026 in Mixed Martial Arts
Casey O'Neill defeated Eduarda Moura by armbar submission during their bout at UFC 331. O'Neill executed the finish by launching Moura into the air before securing the hold.
Why it matters
The victory highlights O'Neill's grappling proficiency in a competitive flyweight matchup. This result serves as a significant marker in the division as other contenders look toward future title opportunities.
The bout ended in the first round after O'Neill successfully transitioned from pushing off her opponent's hips to securing the decisive armbar.
The players
Casey O'Neill
She is a professional mixed martial artist competing in the UFC flyweight division.
Eduarda Moura
She is a professional mixed martial artist who previously competed against Wang Cong.
Wang Cong
She is a professional fighter scheduled to compete for the flyweight championship in October 2026.
The details
After Eduarda Moura landed a straight right hand early in the opening round, O'Neill countered by pulling Moura upward. O'Neill launched her opponent into the air and immediately transitioned into the winning armbar maneuver.
Timeline
September 19, 2026: UFC 331 took place.
October 2026: UFC 332 and the flyweight title fight are scheduled.
Season Trajectory
This win alters the competitive landscape of the flyweight division heading into the championship bout at UFC 332. It clarifies the standing of contenders while Wang Cong prepares for her title fight in October 2026.
O'Neill's win impacts the current flyweight rankings and alters the projected path for title contenders. Following her loss to Wang Cong previously, Moura's position in the division is further impacted by this latest defeat.
The takeaway
O'Neill's ability to finish a fight in the first round underscores the importance of tactical grappling in elite competition. Fans and analysts should monitor how this victory influences divisional movement leading into the upcoming title fight.
What happens next
Wang Cong is scheduled to compete for the flyweight championship at UFC 332 in October 2026.
Further reading
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