How Sean O'Malley (fighter) built a successful career. Explore key moments that defined the journey.
Sean O'Malley is an American professional mixed martial artist competing in the UFC's Bantamweight division. He is the former UFC Bantamweight Champion and currently ranked #1 in the division as of September 17, 2024. O'Malley is a prominent figure in the UFC.
On December 1, 2017, Sean O'Malley made his promotional debut against Terrion Ware at The Ultimate Fighter 26 Finale, winning the fight via unanimous decision.
On March 3, 2018, Sean O'Malley fought Andre Soukhamthath at UFC 222, winning by unanimous decision despite injuring his foot in the third round. Both fighters earned a Fight of the Night bonus.
On October 6, 2018, Sean O'Malley was expected to fight José Alberto Quiñónez at UFC 229, but he withdrew from the fight on September 30 due to a potential Anti-Doping Policy violation.
In March 2019, Sean O'Malley became eligible to return to fighting after serving a six-month suspension by the NSAC for testing positive for ostarine.
On June 21, 2019, Sean O'Malley announced his withdrawal from the bout against Marlon Vera at UFC 239, due to a failed test for ostarine.
On July 6, 2019, Sean O'Malley was scheduled to face Marlon Vera at UFC 239. However, O'Malley withdrew from the bout on June 21 due to a failed test for ostarine.
On December 12, 2019, Sean O'Malley competed at Quintet: Ultra as a member of Team UFC. He submitted Takanori Gomi but was submitted by Héctor Lombard. Team UFC won the tournament.
On March 7, 2020, Sean O'Malley fought José Alberto Quiñónez at UFC 248, winning via TKO in the first round and earning his first Performance of the Night award.
On June 6, 2020, Sean O'Malley faced Eddie Wineland at UFC 250, winning via one-punch knockout in the first round and earning the Performance of the Night award.
On August 15, 2020, Sean O'Malley fought Marlon Vera at UFC 252, losing via TKO in the first round, marking the first defeat of his career. He was later diagnosed with drop foot from a leg kick by Vera.
On September 20, 2020, Sean O'Malley entered the 155lbs Advanced No-gi division of Grappling Industries Phoenix, placing third in a seven-man division, losing only to Robert Degle.
On December 20, 2020, Chael Sonnen put out an open challenge on behalf of O'Malley for his promotion's event, which was answered by James Gallagher. O'Malley reportedly declined the grappling match challenge.
On March 27, 2021, Sean O'Malley faced Thomas Almeida at UFC 260, winning via knockout in the third round, earning the Performance of the Night award, despite a moment where O'Malley thought Almeida was knocked unconscious in the first round.
On July 10, 2021, Sean O'Malley fought Kris Moutinho at UFC 264, winning via TKO in round three and earning the Fight of the Night award, after Louis Smolka pulled out of the fight due to injury.
On December 11, 2021, Sean O'Malley fought Raulian Paiva at UFC 269, winning via TKO in round one and earning his fourth Performance of the Night bonus award.
On July 2, 2022, Sean O'Malley fought Pedro Munhoz at UFC 276. The fight was declared a no contest after O'Malley accidentally poked Munhoz in the eye, rendering him unable to continue early in the second round.
On October 22, 2022, Sean O'Malley fought Petr Yan at UFC 280, winning the bout via split decision. The result was seen as highly controversial, receiving the Fight of the Night bonus and the "2022 Robbery of the Year Award" by Sherdog website editors.
On August 19, 2023, Sean O'Malley faced Aljamain Sterling for the UFC Bantamweight Championship at UFC 292, winning the title by second-round technical knockout and earning another Performance of the Night bonus.
On March 9, 2024, Sean O'Malley defended his title against Marlon Vera in a rematch at UFC 299, winning via unanimous decision and earning his sixth Performance of the Night bonus award.
On September 14, 2024, Sean O'Malley faced Merab Dvalishvili at UFC 306 for his second title defense, losing the fight by unanimous decision.
On September 17, 2024, Sean O'Malley was ranked #1 in the UFC bantamweight rankings.
On June 7, 2025, Sean O'Malley faced Merab Dvalishvili in a championship rematch at UFC 316, losing the fight via a north-south choke submission at the end of the third round.
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