UFC 331: Van vs. Pantoja 2 continues on the early prelims with a fight between Casey O'Neill and Eduarda Moura in the women's flyweight division. Check out our UFC 331 odds series for our O'Neill-Moura prediction and pick.
Casey O'Neill (11-2) has quietly built momentum, bouncing back from a submission loss to Ariane Lipski with a unanimous decision over Luana Santos, then blasting Gabriella Fernandes with a first-round KO in March 2026 to chase a third straight win, as she comes into her fight this weekend against Eduarda Moura.
Eduarda Moura (12-2) is looking to bounce back after dropping a unanimous decision to Wang Cong in February 2026 following a weight miss. Before that setback, she'd beaten former title challenger Lauren Murphy by decision in July 2025, showing she can still compete with veteran names, as she comes into her fight this weekend against Casey O'Neill.
UFC 331 Odds, courtesy of DraftKings.
UFC 331 Odds: Casey O'Neill-Eduarda Moura
Casey O'Neill: -225
Eduarda Moura: +185
Over 2.5 rounds: -245
Under 2.5 rounds: +185
Watch sports LIVE with fuboTV (free trial)Why Casey O'Neill Will Win
O'Neill holds a clear edge on the feet, landing roughly 7.9 significant strikes per minute compared to Moura's 2.6, and her striking accuracy sits near 52% against Moura's 38%. That volume and precision gap suggests O'Neill can outwork Moura in any exchange that stays standing.
Moura also enters off a rocky camp, having missed weight in February before losing a decision to Wang Cong. History shows this is a recurring issue, as she's missed weight in multiple prior UFC appearances, which can sap strength and durability late in fights.
O'Neill's durability stands out too. She's never been knocked out across eight UFC fights and has finished two-thirds of her UFC wins, showing she can both take a punch and close the show.
Reach also tilts in O'Neill's favor at 69 inches to Moura's 67, letting her control range against a smaller opponent who relies heavily on takedowns to change the fight's location.
While Moura lands takedowns at a higher rate, O'Neill's 70% takedown defense means she can likely stay upright long enough to keep landing her heavier volume. Combined with her two career wins over ranked opposition versus Moura's zero, O'Neill looks built to grind out a striking-based decision or finish.
Article Continues BelowWhy Eduarda Moura Will Win
Moura's finishing rate stands out immediately, with five of her twelve career wins coming by submission and four by knockout, giving her a well-rounded arsenal that can end a fight from almost anywhere. That versatility is dangerous against O'Neill, whose lone career loss came via armbar submission to Ariane da Silva.
O'Neill's grappling defense has shown cracks before, and her aggressive takedown attempts often lead to scrambles, exactly the kind of chaotic exchanges where a submission specialist like Moura thrives. If Moura can pull O'Neill into extended ground exchanges, her submission instincts give her a real path to a finish.
Moura also carries legitimate power, having stopped Montserrat Conejo Ruiz by TKO in the second round. That kind of finishing ability means she doesn't need to win every striking exchange cleanly, just land the one shot that changes the fight.
Beyond the tools, Moura has already beaten a former title challenger in Lauren Murphy, proving she can handle high-level, durable competition under pressure. That experience against elite opposition could translate into composure against O'Neill's pace and pressure, especially if Moura mixes her striking with timely takedown attempts to keep O'Neill guessing all fight long.
Final Casey O'Neill-Eduarda Moura Prediction & Pick
This fight likely hinges on whether O'Neill can keep the pace high enough to avoid Moura's finishing instincts. O'Neill's superior volume, landing roughly 7.9 significant strikes per minute compared to Moura's 2.6, gives her the tools to win rounds on the feet if she stays disciplined.
Moura's danger comes in bursts rather than sustained output, with five submission wins and four knockouts showing she doesn't need a full round to change the fight. If O'Neill gets careless in a clinch or takedown attempt, Moura's grappling instincts could exploit the same kind of scramble that led to O'Neill's only career loss.
Moura's recent weight-miss issues and layoff since February work against her conditioning and durability over three rounds. Expect O'Neill to lean on volume striking and takedown defense to control distance and pace.
Look for O'Neill to grind out a clear decision win, staying patient early and pulling away in the championship rounds as Moura's output fades.
Final Casey O'Neill-Eduarda Moura Prediction & Pick: Casey O'Neill (-225), OVER 2.5 Rounds (-245)