Muhammad Ali was a boxer.
The Fight of the Century ( also known as The Fight ) is the title boxing writers and historians have given to the boxing match between WBC/WBA heavyweight champion Joe Frazier ( 26 -- 0 , 23 KOs ) and Ring magazine/lineal heavyweight champion The Cyber Boxing Zone ( CBZ ) website maintains an official list of lineal champions in professional boxing , with input from boxing historian Tracy Callis of the International Boxing Research Organization ( IBRO ) . Muhammad Ali . Notable among these were the first Liston fight ; the `` Fight of the Century '' , `` Super Fight II '' , the `` Thrilla in Manila '' versus his rival Joe Frazier , and `` The Rumble in the Jungle '' versus George Foreman . In professional boxing , the undisputed champion of a weight class is a boxer who is recognized as the world champion at that class by each boxing organization .