Mir began training Kenpo in a school owned by his parents in Las Vegas, earning his black belt as a teenager. After meeting former UFC matchmaker Joe Silva, Mir was convinced to give MMA a shot.
Mir made his professional debut in 2001 and signed with the UFC later that year. At UFC 48 in June 2004, Mir won the UFC Heavyweight Championship. However, a few months later, Mir was involved in a motorcycle accident that would leave him on the sidelines for over a year, and he was eventually stripped of the title.
After a rough return, Mir would get back on winning ways, including a win over Brock Lesnar in the WWE star’s UFC debut. At UFC 92, Mir defeated Antonio Rodrigo Nogueira to win the interim UFC Heavyweight Title. However, Mir loss a rematch with Lesnar to determine the undisputed champion.
Mir received another interim title shot in March 2010 at UFC 111, facing Shane Carwin, but would lose by knockout in the first round. After a three-fight win streak, Mir challenged Junior Dos Santos for the heavyweight title at UFC 146, losing once again.
After 16 years with the UFC, Mir was released from his contract in July 2017. The next month, he officially signed with Bellator.
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