Casey O’Neill is set to face Eduarda Moura in a flyweight fight at UFC 331 on Sept. 19 at Crypto.com Arena in Los Angeles. The booking places O’Neill in position to pursue a third consecutive victory after she rebuilt momentum following a difficult stretch in her UFC run. Marcel Dorff posted the matchup on X and credited Leo Guimaraes with the first report. For O’Neill, the assignment is a chance to keep a comeback stretch moving rather than simply revisit the setbacks that interrupted her earlier unbeaten start.
O’Neill began her UFC career with four straight wins, establishing a strong early run before decision losses to Jennifer Maia and Ariane Lipski changed the direction of that streak. She has since responded with two wins. Her most recent victory cited in the booking report was a first-round knockout of Gabriella Fernandes at UFC Seattle in March, a result that came after she had been away for nearly two years. The report also places that absence in the context of a torn ACL withdrawal that reshuffled UFC 276 plans in 2022. The Moura fight therefore gives O’Neill a clearly defined opportunity: extend the current run and continue moving away from the period marked by injury disruption and consecutive defeats.
A third straight win is the immediate target
The significance of the UFC 331 booking rests in O’Neill’s current sequence. Two wins have rebuilt her position after the losses to Maia and Lipski, and a victory over Moura would make it three in a row. The supplied report states that such a result can move O’Neill closer to the ranked flyweight mix. That is the relevant division context around this fight, without assigning O’Neill a ranking or suggesting that a particular next opponent is guaranteed. The bout is a meaningful measure of whether her momentum can continue in another flyweight matchup.
Moura arrives with a 3-2 UFC record and is coming off a decision loss to Wang Cong. The report describes UFC 331 as a rebound spot for Moura, while also noting a separate issue that surrounds her UFC tenure: she has missed weight three times in the promotion, including before the Wang Cong fight at UFC Vegas 113 in February. That background does not alter O’Neill’s task, but it explains why the matchup carries different immediate stakes for each fighter. O’Neill is chasing extension of a winning streak; Moura is seeking a result that stops her current slide and a clean week on the scale. The contrast gives the flyweight booking a practical competitive frame ahead of Sept. 19.
How O’Neill reached this UFC 331 booking
O’Neill’s path to UFC 331 can be read as two distinct phases. The first included four straight UFC wins. The second has required a rebuild after the decision defeats to Maia and Lipski, as well as the time away connected to the torn ACL withdrawal. Her first-round knockout of Fernandes in March is especially important within the supplied chronology because it was identified as part of the two-win comeback stretch and followed nearly two years away. UFC 331 now offers O’Neill a chance to turn that recovery into a longer winning run. The event has no announced main event in the supplied report, although Brian Ortega versus Renato Moicano and Patricio Pitbull versus Doo Ho Choi are also listed as confirmed matchups. O’Neill versus Moura stands as the flyweight contest that links a rising streak with a direct opportunity to move nearer the ranked picture.
- O’Neill opened her UFC run with four consecutive wins before decision losses to Jennifer Maia and Ariane Lipski.
- O’Neill has since won twice, including a first-round knockout of Gabriella Fernandes at UFC Seattle in March.
| UFC 331 fight detail | Verified information |
|---|---|
| Date and location | Sept. 19 at Crypto.com Arena in Los Angeles |
| Flyweight stakes | O’Neill can move closer to the ranked flyweight mix with a third straight win |
Casey O’Neill’s UFC 331 fight with Eduarda Moura is more than a new date on the flyweight schedule. It is the next test of a two-fight recovery that followed injury disruption, an extended absence and two decision losses. A win would not settle the wider division picture, but the supplied report makes the immediate value clear: O’Neill would extend her streak to three and move closer to the ranked mix. That makes Sept. 19 a consequential checkpoint in her ongoing rebuild.
Sources: MiddleEasy
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