Moura Makes Casey O’Neill Prove Everything Works
Avatar photo Victor Hale
17.09.2026

Moura Makes Casey O’Neill Prove Everything Works

Casey O’Neill spent years trying to recover her body. Eduarda Moura now gets to examine the rebuilt version.

O’Neill returned from a devastating right-knee injury in March and stopped Gabriella Fernandes in the first round. More importantly, for Saturday’s UFC 331, she has since remained healthy enough to complete consecutive camps for the first time in years.

Moura brings exactly the kind of fight that can reveal whether Casey O’Neill’s improvement extends beyond one spectacular comeback.

Bookmaker Sportsbook‘s opening line has O’Neill at -223 and Moura +186, with Over 2.5 rounds -240 and Under +199. My prediction is O’Neill by unanimous decision, with Over 2.5 rounds the betting lean.

Moura Can Keep Changing the Question

O’Neill called Moura an “all-round MMA fighter” this week, contrasting her with the specialists she has often faced.

Moura averages 3.58 takedowns per 15 minutes and owns 80% takedown defense. She has five career submission victories, but her UFC offense doesn’t depend on finding one submission sequence. She can repeatedly force clinches, mat returns, and positional exchanges that interrupt an opponent’s striking rhythm.

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UFC 331 preview: Eduarda Moura changes levels for a takedown during a previous professional flyweight fight.

Casey O’Neill Stopped Training Like Casey O’Neill

The most interesting adjustment happened outside the cage. O’Neill believes overtraining contributed to her injury problems. She told Fox Sports Australia that she can now finish two sessions and resist adding a third, joking retrospectively that “seven training sessions in a day isn’t the best method.”

Returning to Bangtao in Thailand has accompanied that change. She says she feels healthy, calmer and able to fight without the anxiety that previously followed her into the Octagon.

Against Moura, patience has tactical value. Charging through combinations gives the Brazilian easier access to hips and clinches. The more selective O’Neill who returned against Fernandes presents fewer automatic entries.

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Casey O'Neill rises from a grappling exchange during a previous professional flyweight fight.

Moura’s Wrestling Leaves Minutes Behind

Moura can win grappling exchanges without necessarily dominating the overall fight. Her UFC striking volume is 2.57 significant strikes landed per minute, and only 61% of those landed strikes come from standing. That creates openings whenever prolonged control fails to produce damage.

O’Neill’s cleaner combinations can make those transitional minutes expensive.

Another variable: Moura has repeatedly struggled with the scale, including a flyweight miss. O’Neill has discussed it openly but sensibly refuses to build her preparation around something she cannot control.

Minus 223 Asks for Fifteen Minutes In This UFC 331 Bout

O’Neill’s recent freedom makes her the more adaptable fighter here, but Moura’s physical grappling gives her credible routes to individual rounds. That makes the favorite’s moneyline less attractive than the clock.

Betting Analysis

Bookmaker Sportsbook‘s opening line makes O’Neill -223, Moura +186, with Over 2.5 rounds -240 and Under +199.

Neither woman has been stopped by strikes professionally. Moura’s ability to create grappling time can slow O’Neill without necessarily producing enough offense to win, while O’Neill’s improved patience reduces the likelihood of gifting Moura reckless exchanges.

Betting Lean

Over 2.5 rounds at -240.

Prediction: Casey O’Neill by unanimous decision.

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Data Snapshot

FighterEduarda MouraCasey O’Neill
Record12-211-2
Age3228
Height5’6″5’6″
StanceOrthodoxOrthodox
UFC record3-26-2
Wins by KO/TKO44
Wins by submission52
Wins by decision35
Significant strikes landed/min2.577.89
Significant-strike accuracy38%52%
Takedowns per 15 min3.581.43
Takedown defense80%70%

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