10 Undefeated Boxing Streaks You Need To Know About

3. Rocky Marciano - 49-0, 43 KOs (1947-1955)

Rocky in the white trunks there tussling with Archie Moore. Marciano was a real groundbreaker for the sport of boxing. He is a man that transcended weight divisions, taking on all comers no matter their size. He is also the first real box office boxer, paving the way for the likes of Muhammad Ali to not only take the world by storm, but make a shedload of money while doing so. Rocky's crowning glory had to be the win against Joe Louis, with Louis coming out of retirement especially for the fight. Even if he didn't face Joe at his pomp, Rocky had no problems in ending his career once and for all in front of a packed house at Madison Square Garden.