Premise: 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 . He remains the only three-time lineal heavyweight champion , having won the title in 1964 , 1974 , and 1978 . 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 .
Hypothesis: Muhammad Ali was a boxer.
Label: ENTAILMENT