Boxing great Muhammad Ali lost five times during his professional career. The boxers who beat him were Joe Frazier, Ken Norton, Leon Spinks, Larry Holmes and Trevor Berbik. Ali had a total of 56 professional wins, 37 of them by knockout.
Although the origins of the sport date back to prehistoric times, the earliest evidence of boxing comes from Egypt and Mesopotamia. The first recorded reference of a "prizefight" is in Homer's Greek epic "The Iliad."