[Answer] Which of these legendary boxers finished their professional career undefeated?

Step 1 : Introduction to the question "Which of these legendary boxers finished their professional career undefeated?"

...Rocky Marciano is the only heavyweight champion in boxing history to retire with a completely unblemished professional record. Fighting from 1947 to 1955, Marciano finished his career 49–0, with an astonishing 43 knockouts, a feat that has never been matched at the heavyweight level. While other greats on this list—including Muhammad Ali, Joe Louis, and Sugar Ray Robinson—are considered among the sport’s all-time best, each suffered at least one professional loss. Marciano’s perfect record remains one of boxing’s most enduring and celebrated achievements.

Step 2 : Answer to the question "Which of these legendary boxers finished their professional career undefeated?"

Rocky Marciano:

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