It is Mike Tyson when he was fighting with Trevor Berbick He became the youngest heavyweight champion in history.
mike Tyson aged 20.
Iron Mike Tyson was the youngest heavy weight champion ever at 20 years old.
Mike Tyson hold the record for the youngest heavyweight champion of the world at 20 years, 4 months and 22 days old
The answer is former WBA Heavyweight Champion of the World, Nikolai Valuev.
who became the boxing champion?
The current heavyweight boxing champion is Wladmir Klitschko.