The self-proclaimed 'Greatest,' Muhammed Ali won his first 31 fights. Who beat him in the 32nd?

Billed as the "Fight of the Century," the 1971 Ali/Frazier match between two undefeated heavyweights was a highly anticipated spectacle; millions watched around the world. It didn't go well for Ali, who lost after Frazier knocked him down in the final round. Four years later, Ali got his revenge in the legendary “Thrilla in Manila” fight.

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