Sean Sharaf's knockout of Olympic gold medalist Gable Stevenson at UFC 304 was one of combat sports' biggest upsets ever—a minus-2400 favorite lost in 12 seconds. The former Marine's path involved financial struggle, bouncing between fighter houses, sleeping on mats, and sparring elite heavyweights while nursing a broken nose, yet he visualized victory against all odds and landed a perfectly-timed left hook that changed his life. Sharaf defeated Gable Stevenson as a massive underdog (minus-2400 odds) in 12 seconds with a single left hook, potentially the largest upset in heavyweight MMA history and comparable only to Holly Holm's victory over Ronda Rousey in historical significance.