March 8, 1971, at Madison Square Garden in New York City.
It was the first time that two undefeated boxers fought each other for the heavyweight title. It is widely regarded as the biggest fight in history and as arguably the most anticipated and hyped sporting event ever. Frazier won in 15 rounds via unanimous decision. It was the first of a trilogy, followed by the rematch fights Super Fight II (1974) and Thrilla in Manila (1975), both won by Ali.
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