Casey O'Neill vs Eduarda Moura: women's flyweight prelim preview at UFC 331

UFC 331: Van vs. Pantoja 2 lands on Saturday, September 19, 2026 at crypto.com Arena in Los Angeles, and on the early prelims sits Casey O'Neill against Eduarda Moura at women's flyweight, scheduled for 3 rounds. The card carries 13 bouts in our tables, with this pairing on the early prelims.

Tale of the tape

Casey O'Neill ("King"), 28, comes in at 11-2-0, listed at 5'6", with a 69-inch reach, fighting orthodox. Eduarda Moura ("Ronda"), 32, comes in at 12-2-0, listed at 5'6", with a 67-inch reach, fighting orthodox. On the tape, they are level on height and O'Neill holds 2 inches of reach. O'Neill is the younger by 4 years. Both fight orthodox.

• Record: Casey O'Neill 11-2-0 · Eduarda Moura 12-2-0
• Age: Casey O'Neill 28 · Eduarda Moura 32
• Height: Casey O'Neill 5'6" · Eduarda Moura 5'6"
• Reach: Casey O'Neill 69" · Eduarda Moura 67"
• Stance: Casey O'Neill Orthodox · Eduarda Moura Orthodox

What the archive says

Our archive has 1 completed UFC bout for Casey O'Neill, 1 win. That win came inside the distance. Most recently she beat Gabriella Fernandes by KO/TKO in round 1 on Mar 28, 2026.

• W vs Gabriella Fernandes — KO/TKO, R1 (Mar 28, 2026)

Our archive has 2 completed UFC bouts for Eduarda Moura, 1 win and 1 loss. That win went the distance. She last fought on Feb 7, 2026 and lost to Wang Cong by unanimous decision in round 3. UFC Stats career averages list her at 2.57 significant strikes landed per minute at 37% accuracy, 2.5 absorbed per minute with 58% striking defence, 3.58 takedowns per 15 minutes at 34% accuracy and 0.4 submission attempts per 15 minutes; those are career-to-date figures, not a read on this matchup.

• L vs Wang Cong — unanimous decision, R3 (Feb 7, 2026)
• W vs Lauren Murphy — unanimous decision, R3 (Jul 12, 2025)

What to watch

Range is the first thing the tape flags: Casey O'Neill owns a 2-inch reach advantage, which sets the distance Eduarda Moura has to cross to land. From our archive, Casey O'Neill has finished 1 of 1 archived win and Eduarda Moura has finished 0 of 1 archived win. It is scheduled for 3 rounds.

Algo lean: locked. PropBetEdge model pricing for this bout ships with UFC Pro; no pick is shown until the model has produced one.