Mike Tyson was victorious.
Mike Tyson . 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 . Tyson became the lineal champion in 1988 when he knocked out Michael Spinks in 91 seconds of the first round . He won the WBC and WBA titles in 1996 , after defeating Frank Bruno and Bruce Seldon by knockout . 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 .