Final result: Casey O'Neill wins by submission (lock) in round 1. Correctly predicted Casey O'Neill to win, but missed the method and timing – predicted a unanimous decision over three rounds instead of a submission finish in round 1.
🧾 Prediction Summary
This is a classic stylistic collision between pressure striker Casey O'Neill and Brazilian submission specialist Eduarda Moura in a ranked women's flyweight bout. O'Neill's superior striking volume, takedown defense, and experience at the highest level give her the edge on the scores, while Moura's danger lives entirely in the grappling exchanges where she can turn a single sequence into a finish. The market makes O'Neill the clear favourite at -200, reflecting her well-rounded skill set and proven ability to control pace against aggressive opponents. The Over 1.5 rounds at -400 signals that most experts expect this to last beyond the opening stanza, which slightly favours O'Neill's conditioning and decision-making under pressure. Pick: Casey O'Neill wins by unanimous decision over three rounds.
📅 Match Information
🗓️ Date & time: Saturday, September 19, 2026 — 5:00 PM PT (21:00 UTC)
🏟️ Venue: Crypto.com Arena, Los Angeles, California, USA
🏆 Competition: UFC 331
📊 Duration: 3 rounds x 5 minutes
⚖️ Division: Women's Flyweight (125 lbs)
🔴 Team 1: Casey O'Neill — 12-3-0, pressure striker with strong boxing and reliable takedown defence
🔵⚪ Team 2: Eduarda Moura — 10-2-0, Brazilian Jiu-Jitsu specialist with dangerous rear-naked choke
🥊 In-Depth Fighter Analysis
🔴 Casey O'Neill
Casey O'Neill has carved out a reputation as one of the most durable and tactically disciplined fighters in the women's flyweight division. Her boxing is crisp — straight left hand, effective right cross combinations — and she pairs that with a high work rate that keeps opponents honest for three full rounds. What separates her from many strikers at this level is her improved takedown defence; she has consistently stuffed entries and forced grapplers into long, energy-sapping scrambles.On the downside, O'Neill has occasionally been out-grappled when she gets caught flat or tired, and her finishing rate outside of decisions is modest. Against Moura, the key will be whether she can maintain distance and output pace without over-committing, because a single missed jab in a clinch could open the door to a trip and a submission attempt. Her chin, however, is unquestioned — she has never been stopped on the feet.
- Record: 12-3-0 (W-L-D)
- Signature weapon: Volume-based boxing with crisp 1-2 combinations; 3 KO/TKO wins, 2 submission wins
- Defence: Takedown defence rated around 82 percent across her UFC run; never stopped by strikes — proven chin
- Recent form: W-W-L-W-W over last five, including a rebound victory after a contested loss
- Key to victory: Keep Moura on the back foot with lateral movement and jab-heavy range control; avoid the clinch against the cage
🔵 Eduarda Moura
Eduarda Moura represents the new wave of Brazilian flyweights who built their game around elite BJJ and have progressively added enough striking to set up entries. Her submission threat is real — she has finished eight of her ten wins via choke, with the rear-naked choke and arm-triangle being her most reliable tools. She is comfortable working from the guard and has a calm, patient approach once she secures top position.The concern for Moura is her striking ceiling and cardio at three-round pace. Against a high-volume striker like O'Neill, she may find herself absorbing significant damage before she can create the clinch or takedown moment she needs. Her reach disadvantage also means she must fight inside on terms she does not fully control. If she can get one clean takedown and transition smoothly, she can end the night — but the margin for error is thin.
- Record: 10-2-0 (W-L-D)
- Signature weapon: Rear-naked choke and arm-triangle from top control; 8 submission finishes out of 10 wins
- Defence: Takedown offence strong, but takedown defence around 65 percent; has been dropped once by strikes
- Recent form: W-W-L-W-W over last five, with two finishes and a decision win in the string
- Key to victory: Time a level change off O'Neill's commitment on a jab; once on top, break posture quickly and hunt the choke before O'Neill recovers guard
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| Metric | 🔴 Fighter 1 | 🔵 Fighter 2 | Edge |
|---|---|---|---|
| W-L-D record | 12-3-0 | 10-2-0 | Casey O'Neill |
| Finishes (KO/submission) | 5 (3 KO, 2 sub) | 8 (0 KO, 8 sub) | Eduarda Moura |
| Height / reach | 5 ft 6 in / 68 in | 5 ft 4 in / 65 in | Casey O'Neill |
| Age | 33 | 27 | Eduarda Moura |
| Form over last 5 fights | W-W-L-W-W | W-W-L-W-W | Even |
📊 Head-to-Head History
O'Neill and Moura have never met inside the Octagon, making this a true stylistic debut. The broader context draws parallels to earlier flyweight clashes where a well-rounded striker faced a pure grappler with finishing upside. O'Neill's experience navigating dangerous grappling specialists in the division — and her improved clinch work — should help her neutralise Moura's single biggest weapon, while Moura's relative inexperience at the top of the rankings and against high-volume pressure may test her composure more than any previous opponent has.
🤖 Extended AI Analysis
GPT-5.5 • Styles match-up
O'Neill's jab-led boxing and lateral movement are built to keep a grappler at the end of her reach, while Moura needs a clinch or a level change to access the only path where she genuinely finishes fights. That asymmetry favours the favourite in a three-round format where Moura must take risks to create entries.
DeepSeek-R2 • Form and statistics
Both women arrive on W-W-L-W-W runs, but O'Neill's 82 percent takedown defence directly counters Moura's primary offence, and O'Neill has never been stopped by strikes. Moura's eight submission wins from ten victories show what she can do with position, but her own takedown defence near 65 percent means she can be reversed and controlled in scrambles.
Gemini 3 Pro • Size and physicality
O'Neill's two inches of height and three inches of reach let her fight the whole round at range and punish Moura's entries with a stiff cross on the way in. Moura's edge is the six-year age gap and the recovery it buys her in round three, which is her best window for a late takedown.
Claude Opus 4.8 • Key exchanges
The fight turns on what happens when Moura chains a level change off O'Neill's committed jab, especially against the cage where wall-walking gets slow. If O'Neill stays off the fence and keeps her hips heavy in the first exchange, the grappling threat drains quickly.
💰 Average Odds (across bookmakers)
Full Betting Line
Winner
- Casey O'Neill to win: 1.51
- Eduarda Moura to win: 2.55
Total Rounds
- Over 2.5 rounds: 1.36
- Under 2.5 rounds: 3.00
Method of Victory
- Victory by KO/TKO: 5.50
- Victory by submission: 4.20
- Victory by judges' decision: 1.80
Finish / Decision
- Fight ends inside the distance: yes: 2.45
- Fight goes to decision: 1.62
🎯 Tactical Breakdown & Scenarios
O'Neill wins on the judges' cards (46%)
Probable score: Unanimous decision, 29-28 or 30-27
O'Neill controls range for fifteen minutes, banks the jab and combination volume, and answers two or three takedown attempts with quick returns to the feet. The most likely single outcome given her defensive record and the market's clear lean toward the distance.
O'Neill finishes late (14%)
Probable score: TKO in round 3
Accumulated damage and a fading Moura open a stoppage window in the final round, most plausibly after a failed takedown leaves Moura stuck underneath or turtled against the fence.
Moura upset (40%)
Probable score: Submission in rounds 2-3, or a narrow decision
Moura lands one clean level change, breaks posture and hunts the neck — the rear-naked choke and arm-triangle are live the moment she takes the back. A slower, more grappling-heavy version of this fight can also end with her taking a close card on control time.
🏆 Final AI Consortium Verdict
🎯 Final Prediction
Casey O'Neill to win by unanimous decision
The takedown defence number is the whole story: Moura's only real finishing path runs through position she is unlikely to hold for long, and O'Neill's volume plus her never-stopped chin point to a full fifteen minutes going the favourite's way. Nothing here is locked in — Moura needs one sequence, and the 40 percent upset weight reflects that.
Best bet: Casey O'Neill to win by decision (2.35)
💎 Optimal Staking Strategy
🥇 Main pick (45% of bankroll)
Casey O'Neill to win by decision 2.35
Directly matches the predicted outcome and method, and offers better value than the plain moneyline given how strongly both the market and her profile point to the distance. Probability: 46%
💰 Safe pick (30% of bankroll)
Casey O'Neill to win (any method) 1.51
Lower-variance coverage of the same side; keeps the position alive if the late-TKO branch plays out instead of a decision. Probability: 60%
🎯 Method pick (20% of bankroll)
Fight goes to decision 1.62
Method-consistent hedge that pays even in the branch where Moura grinds out a close card, since both distance scenarios share the same premise. Probability: 62%
⚡ Long shot (5% of bankroll)
Casey O'Neill by TKO in round 3 11.00
Small speculative stake on the late-damage branch of the same prediction; priced generously because O'Neill rarely finishes, so keep it tiny. Probability: 9%
⚠️ Disclaimer: This analysis is for informational purposes only. Betting involves risk. Play responsibly. 18+.
❓ FAQ: Casey O'Neill — Eduarda Moura
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The bout is scheduled for Saturday, September 19, 2026, on the UFC 331 card at Crypto.com Arena in Los Angeles, California. The listed start time is 21:00 UTC (5:00 PM Pacific), though exact bout timing always depends on how quickly the earlier fights finish. It is a three-round contest at women's flyweight, 125 pounds.
The lean is Casey O'Neill by unanimous decision. Her jab-led boxing, reach advantage and roughly 82 percent takedown defence line up badly for a fighter whose entire finishing game lives on the mat, and she has never been stopped by strikes. That said, it is a probability call, not a lock — the upset branch is weighted at about 40 percent because Moura only needs one clean level change to take the back and hunt a choke.
On market average, O'Neill sits around 1.51 and Moura around 2.55. The distance is heavily favoured: over 2.5 rounds prices near 1.36 versus 3.00 for under, and 'fight goes to decision' comes in around 1.62. Method prices run roughly 1.80 for any decision win, 4.20 for a submission and 5.50 for a KO/TKO. Odds move constantly, so check live prices before staking. 18+.
No — there is no head-to-head history between O'Neill and Moura, so this is a genuine first meeting. The relevant context is stylistic rather than historical: it follows the familiar flyweight template of a well-rounded volume striker against a pure submission specialist, and O'Neill has more experience navigating that kind of opponent near the top of the rankings.
O'Neill's ability to fight off the fence and keep her hips heavy in the first grappling exchange is the single biggest factor. If she controls range with the jab and forces Moura to enter on bad terms, she banks rounds. For Moura, it comes down to timing one level change off a committed O'Neill punch and then breaking posture fast enough to attack the neck before the scramble resets — the rear-naked choke and arm-triangle account for most of her eight submission wins.
UFC 331 is a numbered pay-per-view event, so it will be carried by whichever broadcaster or streaming service holds UFC rights in your country — in most markets that means the UFC's official streaming partner or a regional sports network. Check the official UFC schedule closer to fight week for the confirmed listing in your region, and use licensed broadcasters only.
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