Ali versus Frazier, March 1971
On March 8, 1971, at Madison Square Garden, Muhammad Ali fought Joe Frazier for the heavyweight title in his comeback after three and a half years of exile for refusing induction into the Army. Frazier kept pressing forward with body punches and left hooks, dropped Ali with a left hook in the fifteenth round, and won a unanimous decision. It was Ali's first professional loss, and it tested whether his genius could survive the loss of his peak years outside the ring.