Highlights and knockouts of the only retired undefeated heavyweight champion of the world in boxing history. Rocky Marciano. Rocky Marciano was an intimidating monster of a fighter. An unstoppable force that threw bomb after bomb. Hit him with everything you got, but he will still chase you down. When you're in the ring with Rocky, you are fighting for your life. He knocked out four legends, giving them the biggest beatings of their career. And retired undefeated as the heavyweight champion of the world. The only person in history to ever do so. The world remembers him for being a gentleman out of the ring. But inside the ring, he was something else. He was a savage. Song: Vengeance - Zack Hemsey
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