Mike Tyson was in the heaviest category of a sport.
Michael Gerard Tyson ( [ ˈtaɪsən ] born June 30 , 1966 ) is an American former professional boxer who competed from 1985 to 2005 . He reigned as the undisputed world heavyweight champion and holds the record as the youngest boxer to win a heavyweight title at 20 years , 4 months and 22 days old . Weight class (boxing) . The top class , with no upper limit , is called heavyweight in professional boxing and super heavyweight in amateur boxing .