Eduarda Moura is known by the nickname "Rondinha," a reference to the legend of women's MMA, Ronda Rousey . However, at UFC 331 , the Brazilian suffered a submission worthy of the former champion. Scheduled for the preliminary card of the event, Eduarda started the fight well, but was surprised by Casey O'Neill , who locked in an armbar and secured the victory.
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With the loss, Eduarda Moura reached a record of three wins and three losses in the UFC. O'Neill, on the other hand, achieved her seventh victory.
High-quality Jiu-Jitsu
Eduarda started the fight aggressively and, in the first few seconds, landed a strike that unbalanced Casey O'Neill and took the Australian to the ground. The Brazilian took advantage of the moment to take control, secure half-guard, and work her ground and pound against her opponent.
Subsequently, Eduarda managed to advance her position, passed Casey's guard, and even threatened a choke. However, the Australian found an opening to regain her guard and used her feet to unbalance the Brazilian and push her away.
In the next move, Casey O'Neill took advantage of the position to attack Eduarda's arm and quickly locked in an arm-lock. With no room to escape the technique, the Brazilian was forced to tap out, ending the fight with a submission reminiscent of the specialty that marked Ronda Rousey 's career.
INSANE TRANSITION TO ARMBAR FOR CASEY O'NEILL 🔥
📺 @paramountplus pic.twitter.com/JFmOoW1UBU
— UFC on Paramount+ (@UFConParamount) September 19, 2026
UFC 331 results
MAIN CARD
Flyweight (up to 56,7 kg): Joshua Van defeated Alexandre Pantoja by unanimous decision (49-46, 49-47, 50-45) and defended his title.
Lightweight (up to 70,3 kg): Arman Tsarukyan defeated Mauricio Ruffy by knockout (elbow strike) at 4:56 of round 1.
Featherweight (up to 65,7 kg): Patricio Pitbull defeated Dooho Choi by knockout (punches) at 3:28 of round 1.
Heavyweight (up to 120,2 kg): Sean Sharaf defeated Gable Stevenson by knockout (punch) at 12 seconds of round 1.
Light heavyweight (up to 92,9 kg): Alonzo Menifield defeated Iwo Baraniewski by split decision (29-28, 28-29, 29-28)
PRELIMINARY CARD
Bantamweight (up to 61,2 kg): Marlon Vera defeated Charles Jourdain by technical knockout (punches) at 2:02 of round 3.
Heavyweight (up to 120,2 kg): Robelis Despaigne defeated Tai Tuivasa by split decision (29-28, 28-29, 29-28)
Featherweight (up to 65,7 kg): Michael Aswell Jr. defeated Joo Sang Yoo by split decision (29-28, 28-29, 29-28)
Middleweight (up to 83,9 kg): Ryan Gandra defeated Ozzy Diaz by knockout (punches) at 2:04 of round 1.
Middleweight (up to 83,9 kg): Edmen Shahbazyan defeated Brunno Hulk by unanimous decision (29-28, 29-28, 30-27)
Flyweight (up to 56,7 kg): Casey O'Neill defeated Eduarda Ronda by submission (armbar) at 3:22 of round 1.
Featherweight (up to 65,7 kg): Joanderson Tubarão defeated Giga Chikadze by knockout (punches) at 1:57 of round 1.
Johnny Walker opens up about his heavyweight debut at UFC 332.
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