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 . Tyson retired from professional boxing in 2006 , after being knocked out in consecutive matches against Danny Williams and Kevin McBride .