Highlights and knockouts of the only retired undefeated heavyweight champion of the world in boxing history. Rocky Marciano. Rocky Marciano was an ...

Rocky Marciano retired undefeated as a professional with 49 fights, 43 by KO. He overcame many obstacles to win his title, and how he did so can help ...

Rocky Marciano was an American professional boxer who competed from 1947 to 1955, and held the world heavyweight title from 1952 to 1956 - gissaquid.