Muhammad Ali is knocked down by "Smokin" Joe Frazier at Madison Square Garden. The so-called "Fight of the Century" was the first time two undefeated heavyweight champions fought for the title. Frazier sealed the victory with a knockdown in the 15th round and went on to win the decision.
Known for his aggressive charm, invincible attitude and colorful boasts, Muhammad Ali became the first heavyweight champion to regain the title three times. He retired in 1979, having lost only three of his 59 career fights.