Mike Tyson fought another boxer.
Mike Tyson . He won the WBC title in 1986 after stopping Trevor Berbick in two rounds , and added the WBA and IBF titles after defeating James Smith and Tony Tucker in 1987 . In 1990 , Tyson lost the titles to underdog Buster Douglas , who knocked him out in the tenth round . With his defeat of Bruno , Tyson joined Floyd Patterson , Muhammad Ali , Tim Witherspoon , Evander Holyfield , George Foreman as the only men in boxing history to have regained a heavyweight championship after having lost it . After being stripped of the WBC title in the same year , Tyson lost the WBA title to Evander Holyfield by an eleventh-round stoppage . In 2002 , Tyson fought for the world heavyweight title again at the age of 35 , losing by knockout to Lennox Lewis .