Mike Tyson is a boxer.
Heavyweight is a weight class in boxing and other combat sports . 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 . This made Tyson the first heavyweight boxer to simultaneously hold the WBA , WBC and IBF titles , and the only heavyweight to successively unify them . The World Boxing Council ( WBC ) is one of four major organizations which sanction world championship boxing bouts , alongside the International Boxing Federation ( IBF ) , World Boxing Association ( WBA ) and World Boxing Organization ( WBO ) .