Casey O’Neill is set to face Eduarda Moura at UFC 331 on Sept. 19 at Crypto.com Arena in Los Angeles. The flyweight booking gives O’Neill a chance to extend her two-fight winning streak and gives Moura a rebound spot after her decision loss to Wang Cong.
Marcel Dorff posted the matchup on X, crediting Leo Guimaraes with the first report.
Casey O’Neill will fight Eduarda Moura at #UFC331 on September 19th. (first rep. @leoguimaraesmma) #UFC #MMA #UFCParamount #UFConParamount #UFC2026 pic.twitter.com/hkTDaZwA4e
— Marcel Dorff (@BigMarcel24) July 25, 2026
O’Neill opened her UFC run with four straight wins before decision losses to Jennifer Maia and Ariane Lipski. She has since rebuilt with two wins, including a first-round knockout of Gabriella Fernandes at UFC Seattle in March after nearly two years away. That comeback stretch follows the torn ACL withdrawal that reshuffled UFC 276 plans in 2022 and the Jennifer Maia setback that ended her unbeaten start.
Casey O’Neill Gets Another Flyweight Test At UFC 331
Moura enters with a 3-2 UFC record. The Brazilian has also missed weight three times in her UFC stint, including before the Wang Cong fight at UFC Vegas 113 in February.
O’Neill can move closer to the ranked flyweight mix with a third straight win. Moura needs a clean week on the scale and a result that stops her current slide.
UFC 331 still has no announced main event. Other confirmed matchups include Brian Ortega vs. Renato Moicano and Patricio Pitbull vs. Doo Ho Choi.
