49 wins
Rocky Marciano retired in 1956 with 49 wins and no losses. He is the only heavyweight champion in boxing history to retire completely undefeated.
It is absurd for a heavyweight champion to retire without a single loss.
Source: Wikipedia, Rocky Marciano. Verified against Wikipedia, Rocky Marciano and Encyclopedia.com, Rocky Marciano biography on 2026-11-08.
Rocky Marciano retired in 1956 with 49 wins and no losses. He is the only heavyweight champion in boxing history to retire completely undefeated. It is absurd for a heavyweight champion to retire without a single loss. Source: Wikipedia, Rocky Marciano. Verified against Wikipedia, Rocky Marciano and Encyclopedia.com, Rocky Marciano biography on 2026-11-08.
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