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#4. Matt Serra – UFC 83
Georges St-Pierre vs. Matt Serra is still regarded as one of the biggest upsets in the promotion’s history. Serra won TUF season 4 and, as a result, was awarded a title shot against GSP.
Many assumed that after beating Matt Hughes, ‘Rush’ wouldn’t have too much trouble making his first title defense against Serra. That wasn’t the case as the TUF winner dropped St-Pierre with a powerful right-hand and finished him with ground strikes. The upset was the biggest turning point of his career as he made the necessary adjustments and never lost another fight.
Watch St-Pierre take on Matt Serra below:
The rematch took place one year after their first bout and had a much different result. This time, St-Pierre was the aggressor and finished Serra with knees on the ground to earn the TKO win and regain the welterweight championship.
#3. B.J. Penn – UFC 58 and 94
St-Pierre had two wins over UFC Hall of Famer B.J. Penn, one of the best fighters of his era. He first defeated Penn in 2006, when the promotion booked a Canada vs. USA card. It was a back-and-forth bout that saw both fighters have their moments. St-Pierre earned a split-decision win after the judges scored the bout 29-28, 28-29, and 29-28.
The highly-anticipated rematch took place three years later when ‘Rush’ was welterweight champion, and ‘The Prodigy’ was lightweight champion. This was significant as it was the first time two active champions fought each other in the promotion. St-Pierre again got his hand raised after Penn’s corner stopped the fight at the end of the fourth round.
There was some controversy following the rematch as Penn accused St-Pierre’s corner of applying too much vaseline on him. He felt that ‘Rush’ was able to slide out of the exchanges and ensured that he wouldn’t have any success grappling.
