mike Tyson aged 20.
Mike Tyson hold the record for the youngest heavyweight champion of the world at 20 years, 4 months and 22 days old
It is Mike Tyson when he was fighting with Trevor Berbick He became the youngest heavyweight champion in history.
ali
Muhammad ali
Mohamed Ali
Not at this time.
Rocky Marciano
Rocky Marciano is the only heavyweight champion not to loose a fight.
Joe Louis
Of boxing...honestly, who cares anymore.
joe louis
geroge forman