Sean O’Malley: the Montana striker who became UFC bantamweight champion | Ultimate Fighter Reunion

Why fans still care

SEAN O’MALLEY turned a striking style his first coaches did not try to change into a UFC title. He has 13 knockout wins and nine UFC bonuses, a division record.

He came from a small Montana city, built a big following, and won the bantamweight title in 2023. In 2026 he won on the White House lawn.

Early life

He was born on 24 October 1994 and grew up in Helena, Montana. His family built a two-storey house there when he was three, and he lived in it for 16 years. He left Capital High School in his sophomore year. He has said growing up in Montana molded who he was.

Getting started

He began kickboxing and boxing at 16 with Team Proven Grounds in Montana, where his coaches were Johnny Aho and Steven Jimenez. In mid-2014, at 19, he packed his Nissan Altima and drove to Glendale, Arizona, to train at the MMA Lab. He had $2,000 to his name and shared a $650 apartment with Tim Welch, who later became his head coach. His professional debut came on 6 March 2015, a first-round stoppage of Josh Reyes.

Career chapters

1. 2015Professional debut
2. 2017Contender Series knockout earns a UFC contract
3. 2020Knocks out Eddie Wineland, then loses to Marlon Vera
4. 2022Beats Petr Yan on a split decision
5. 2023Stops Aljamain Sterling to win the UFC bantamweight title
6. 2024Beats Vera in a title defence, then loses the title to Merab Dvalishvili
7. 2026Beats Song Yadong and Aiemann Zahabi

Contender Series and early UFC 2017 to 2020

On 5 May 2017 he knocked out Alfred Nuzzo with a wheel kick at LFA 11. On 18 July 2017 he knocked out Alfred Khashakyan on Dana White’s Contender Series and earned a UFC contract, signing at 8-0. He beat Terrion Ware and Andre Soukhamthath on decisions. In 2018 he was suspended for six months after testing positive for ostarine, and a 2019 fight with Vera was called off after trace amounts were found again; he said he had never intentionally taken a banned substance. In 2020 he stopped José Quiñónez and knocked out the former WEC champion Eddie Wineland in the first round.

Vera, Yan and the title 2020 to 2023

On 15 August 2020 at UFC 252 Marlon Vera, Who’s Who number 10 stopped him in the first round, his first professional loss. ESPN later reported that a leg kick had hit his peroneal nerve, leaving him with a temporary drop foot. He came back with stoppages of Thomas Almeida, Kris Moutinho and Raulian Paiva. His 2022 fight with Pedro Munhoz ended in a no contest after an accidental eye poke. At UFC 280 in Abu Dhabi he beat former champion Petr Yan on a split decision. On 19 August 2023 at UFC 292 at TD Garden in Boston he stopped Aljamain Sterling, who had won nine straight, with a right hand and punches 51 seconds into the second round.

Champion and after 2024 to 2026

At UFC 299 in Miami on 9 March 2024 he beat Vera on a unanimous decision, outlanding him 230 to 89 in significant strikes, a bantamweight title-fight record per ESPN. On 14 September 2024 he lost the title to Merab Dvalishvili on a unanimous decision at UFC 306, the first UFC card at the Sphere in Las Vegas, and posted, “Over promised, under delivered. Sorry.” Dvalishvili submitted him in the third round of their rematch at UFC 316 in June 2025. He beat Song Yadong on a unanimous decision at UFC 324 in January 2026, and on 14 June 2026 he stopped Aiemann Zahabi in the second round at UFC Freedom 250 on the South Lawn of the White House.

Style, technique and the corner

How he fights

He is a counter-striker who switches stances. At 5 ft 11 in with a 72-inch reach, he is tall for the division. Jack Slack’s Fight Primer described his cross-step footwork, using a front kick and a step across to land the straight left. UFC.com puts his output at 5.98 significant strikes a minute at 60 per cent accuracy. Early in his career, coaches named wrestling and the ground game as areas to improve. He has said his goal is not just to win but to win by knockout.

Teams and gyms

In Montana he trained with Team Proven Grounds. Since 2014 he has trained at the MMA Lab in Glendale, Arizona, where Tim Welch, a Great Falls native and his best friend, is his head coach. He has said that John Crouch at the MMA Lab hated his style at first.

Stories people still tell

1. Suga.

   UFC.com quotes his explanation of the nickname: “Because I’m so sweet to watch”.

2. $2,000 and an Altima.

   He left Helena in 2014 with everything he owned in one car.

3. The White House.

   In June 2026 he won on the UFC card held on the South Lawn of the White House.

Legacy

He holds the UFC bantamweight record for bonuses, per UFC.com, and won the 2024 ESPY for Best UFC Fighter. He admired Conor McGregor, Who’s Who number 43 (story coming soon) and modelled parts of his career on him, ESPN reported in 2024. He is married with two children.