The self-proclaimed Greatest of All Time backed it up with a record that speaks for itself: 56 wins, Olympic gold, and three heavyweight championships. Ali's footwork was ballet, his jab was a piston, and his trash talk was Shakespeare in boxing gloves. He floated like a butterfly and stung like a freight train disguised as a bee.

Iron Mike Tyson became the youngest heavyweight champion in history at age 20 and terrorized the boxing world with concussive power that bordered on illegal. His peek-a-boo style and devastating uppercuts ended 44 fights by knockout, often in the first round. Opponents didn't just lose to Tyson—many admitted they were beaten before the bell even rang.