Rocky Marciano retired with a undefeated 49-0 record. The only heavyweight to accomplish such a feat.
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.
Joe Louis held the heavyweight boxing champion title for 12 years (1937-1949), a period that is undefeated until today.
Mike Tyson 20 years old.
Rocky Marciano Won the title from Jersey Joe Walcott Final defense was against Archie Moore retired as champion; undefeated
It is Mike Tyson when he was fighting with Trevor Berbick He became the youngest heavyweight champion in history.
= Wladimir Klitschko is the IBF, WBO & IBO Heavyweight Champion. = = Ruslan Chagaev is the WBA Heavyweight Champion = = Oleg Maskaev is the WBC Heavyweight Champion =