Premise: Trevor Berbick ( August 1 , 1954 -- October 28 , 2006 ) was a Jamaican Canadian professional boxer who competed from 1976 to 2000 . He won the WBC heavyweight title in 1986 by defeating Pinklon Thomas , but lost it in his first defence to Mike Tyson , who was then undefeated at 20 years old . Berbick was also the last boxer to fight Muhammad Ali , defeating him in 1981 . As an amateur , Berbick won a bronze medal in the heavyweight division at the 1975 Pan American Games . In both his early and late professional career he held the Canadian heavyweight title twice , from 1979 to 1986 and 1999 to 2001 .
Hypothesis: Trevor Berbick was born on October 28th, 2006.
Label: CONTRADICTION