He Was! Retired unbeaten with a 49-0 record, 43 wins by Ko. The man died in a plane wreckage years later.
Rocky Marciano is the only heavyweight champion not to loose a fight.
He was world heavyweight boxing champion from 1952 until his retirement in '56.
Yes, Marciano won the title against Jersey Joe Walcott in 1952. He retired as champion in 1956.
Rocky Marciano retired with a undefeated 49-0 record. The only heavyweight to accomplish such a feat.
Jersey Joe Walcott was the champion during those times, he lost his title to Rocky Marciano in 1956