Leon Spinks def. Muhammad Ali – 1978:
‘The Greatest’ expected an easy bout from relative newcomer Spinks in 1978, as Spinks had only seven professional bouts heading into his showdown with Ali. He shocked the boxing world by out-boxing Ali over the course of 15 rounds to win a decision.
Spinks did not tire throughout the fight even though it was far from easy. He became the only man to take the title from Ali. The legendary boxer had only lost fights where he was challenging for the belt or non-title bouts. Spinks was later stripped of his WBC title for refusing to defend it against Ken Norton, instead facing Ali in a rematch for the WBA belt. This time ‘The Greatest’ came prepared and won by unanimous score. But Spinks’ first win over Ali remains one of the biggest upsets in boxing history.