Joe Frazier was billed as the 'Fight of the Century,' held on March 8, 1971, at Madison Square ... Joe Frazier knocks down Muhammad Ali in the 15th round at Madison Square Garden.

Frazier had won the WBA and WBC titles in February 1970, titles that had been stripped from Muhammad Ali, and had successfully defended those titles four times, including an iconic 1971 victory ...