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Boxer Muhammad Ali steps away from a punch thrown by boxer Joe Frazier during their heavyweight title fight at Madison Square Garden in 1971. Frazier became the undisputed heavyweight champ of the world by winning a unanimous 15-round decision.

Boxer Muhammad Ali steps away from a punch thrown by boxer Joe Frazier during their heavyweight title fight at Madison Square Garden in 1971. Frazier became the undisputed heavyweight champ of the world by winning a unanimous 15-round decision.