Mike Tyson was knocked out.
Mike Tyson . Tyson became the lineal champion in 1988 when he knocked out Michael Spinks in 91 seconds of the first round . In 1990 , Tyson lost the titles to underdog Buster Douglas , who knocked him out in the tenth round . Tyson retired from professional boxing in 2006 , after being knocked out in consecutive matches against Danny Williams and Kevin McBride .