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He was the heavyweight contender who scored more KO's than Jack Dempsey and Joe Louis while scoring more KO's than Rocky Marciano, Sonny Liston, Joe Frazier and Mike Tyson had fights. He was the only fighter who fought top ten all-time great heavyweight champions Muhammad Ali, Joe Frazier and George Foreman. He was the first fighter to last 15 rounds against Muhammad Ali and was later referred to by Ali as the toughest man he ever fought. [details]