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UFC 331Women's FlyweightEarly PrelimsSep 20, 2026

Casey O'Neill vs Eduarda Moura

The AI’s call

Casey O'Neill68%by KO/TKO · Round 2

O'Neill's striking dominance and recent form overcome Moura's grappling edge; likely finish favors the striker.

AI vs the market

O'Neill65%
Moura36%
AI

AI 68% · crowd 65% on O'Neill

Aligned. The AI and the market read this fight the same way — 4 points apart.

The breakdown

Casey O'Neill enters on a two-fight winning streak with a recent R1 KO, showing sharp striking output at 7.89 sig.strikes/min with 52% accuracy. She absorbs 5.53/min but maintains solid defense. Eduarda Moura is the more experienced grappler (3.58 TD/15min vs O'Neill's 1.4) with five submission wins, but her striking is significantly lower volume (2.57/min, 38% accuracy) and she just lost a decision to Cong Wang. O'Neill's striking advantage is pronounced, and her recent form—especially the knockout finish—suggests momentum and timing. Moura's wrestling could create scrambles, but O'Neill's submission defense (only 1 loss by sub in 11 wins) and superior striking output should dominate the exchanges. Age (28 vs 32) and recent form both favor O'Neill.

O'Neill — edges

  • Striking output 3x higher (7.89 vs 2.57 sig.strikes/min)
  • 52% striking accuracy vs 38%
  • Recent R1 KO finish shows sharp timing
  • Two-fight winning streak vs one-fight losing streak

Moura — edges

  • Takedown rate 2.5x higher (3.58 vs 1.4 TD/15min)
  • Five submission wins show grappling threat
  • More UFC experience and ranked opponent history
  • Never finished by KO/TKO (only decisions and subs)

X-factor

Moura's wrestling could disrupt O'Neill's rhythm early; if she lands a takedown and controls, submission threat is real.

How the market sees it ending

How it ends

Goes the full distance59%
Ends by KO / TKO28%
Ends by submission30%

Who lands the knockout

O'Neill by KO/TKO27%
Moura by KO/TKO27%

Tale of the tape

O'NeillMoura

Physical

28

Age

32
66"

Height

66"
69"

Reach

67"

Record

11

Wins

12
2

Losses

2
4

Wins by KO/TKO

4
2

Wins by submission

5

Striking

7.89

Landed / min

2.57
5.53

Absorbed / min

2.5
52%

Accuracy

38%
0.17

Knockdowns / 15 min

0

Grappling

1.4

Takedowns / 15 min

3.58
35%

TD accuracy

35%
0.7

Sub. attempts / 15 min

0.42

About these numbers

Market probability is the live crowd consensus from Polymarket, a public prediction market where people trade on outcomes — we read it as a data signal for what the crowd expects, and it updates continuously. AI probabilityis our own model’s independent read of the matchup from fighter data alone; it never sees the market price, which is why the two can disagree.

All of it is published for analysis and entertainment. Nothing here is betting advice, a recommendation, or a prediction of a guaranteed result — fights are volatile and upsets are the sport.