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With Ali having his boxing licence revoked by most American states from 1967-70 for refusing induction into the US Army, ‘Smokin’ Joe Frazier bulldozed all before him to inherit the vacant crown. His licence restored, Ali quickly moved into contention to challenge Frazier for the title. In a cracking fight in Madison Square Garden on March 8, 1971, Frazier floored the former champion in the final round before edging a close 15-round decision.

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