Tanner Boser

Background Boser was born and raised in Bonnyville, Alberta, Canada, by a gym owner mother and oil field worker father. Tanner was homeschooled until high school. He trained karate for almost a decade while growing up, reaching a black belt in the discipline. After graduating from high school, Boser worked in the local oilfield industry. and has also fought around the world. Promotions such as fighting for Absolute Championship Akhmat and M-1 Global has taken him to Kazakhstan, Russia, United Arab Emirates, England and Australia. Having previously defended his Heavyweight Championship for the third time, when Boser was offered to sign with the Ultimate Fighting Championship in 2019. However his debut would be delayed as his opponent tested positive for a banned substance and the fight was called off due to a ruling from the United States Anti-Doping Agency.

Boser's debut eventually took place on October 18, 2019, at UFC on ESPN 6 against Daniel Spitz. He won the bout via unanimous decision earning him his first victory in the promotion.

Boser next faced Ciryl Gane on December 21, 2019, at UFC Fight Night 165. He lost the fight via unanimous decision.

Boser was scheduled to face Jeff Hughes on March 28, 2020, at UFC on ESPN: Ngannou vs. Rozenstruik. However, the event was cancelled due to the COVID-19 pandemic.

Returning to action amidst the COVID-19 pandemic, Boser faced Philipe Lins at UFC on ESPN: Poirier vs. Hooker on June 27, 2020. He won the fight via knockout in the first round. This win earned him the Performance of the Night award.

As the first fight of his new four-fight contract, Boser next faced Raphael Pessoa at UFC on ESPN: Whittaker vs. Till on July 26, 2020. Boser won the fight via technical knockout in round two. This win earned him the Performance of the Night award.

Boser was expected to face Andrei Arlovski on October 4, 2020 at UFC on ESPN: Holm vs. Aldana. However a sickness with Arlovski pushed the bout to UFC on ESPN: Santos vs. Teixeira. Boser lost the fight via unanimous decision.

Boser faced Ilir Latifi on June 5, 2021, at UFC Fight Night: Rozenstruik vs. Sakai. He lost the fight via split decision.

As the first fight of his new, four-fight contract Boser faced Ovince Saint Preux on June 26, 2021, at UFC Fight Night 190. He won the fight via knockout in the second round.

Boser was scheduled to face Sergei Pavlovich on December 4, 2021, at UFC on ESPN 31. However, due to travel issues, the bout was scrapped.

Boser was scheduled to face Rodrigo Nascimento on April 23, 2022, at UFC Fight Night 205. However, Nascimento withdrew from the event for unknown reasons, and he was replaced by Alexander Romanov. In turn Boser was out of the fight due to an injury. He was replaced by Chase Sherman.

Boser was rebooked against Rodrigo Nascimento for September 17, 2022 at UFC Fight Night: Sandhagen vs. Song. Boser lost the fight via split decision.

Boser faced Ion Cuțelaba in a light heavyweight contest on April 15, 2023, at UFC on ESPN 44. He lost the fight via first-round technical knockout.

As the last fight of his prevailing contract, Boser faced Aleksa Camur on August 5, 2023, at UFC Fight Night 225. He won the fight by unanimous decision. Following the victory, Boser became a free agent.

Global Fight League On December 11, 2024, it was announced that Boser was signed by Global Fight League. However, in April 2025, it was reported that all GFL events were cancelled indefinitely.

Return to the UFC After competing at an independent promotion, Boser made his return to the UFC against Gökhan Saricam on April 18, 2026, at UFC Fight Night 273. He lost the fight by technical knockout in the second round.

Boser is scheduled to face Jhonata Diniz on October 17, 2026, at UFC Fight Night 291.

Championships and accomplishments Ultimate Fighting Championship* Performance of the Night (One time)