an American professional mixed martial artist and freestyle wrestler. He is the former Ultimate Fighting Championship (UFC) Flyweight Champion and Bantamweight Champion. He is the fourth UFC fighter to hold titles in two different weight classes simultaneously, and the second to defend titles in two different weight divisions. He is the only person to win an Olympic gold medal and a UFC title.[6] He is considered to be among the greatest combat athletes of all time due to his accomplishments in MMA and freestyle wrestling.