UFC title fights are a test of skill, heart, and athleticism in mixed martial arts. But this sport is unpredictable and there are quite a few upsets that shock everyone and leave the fans in a heavy state of disbelief. Many of these match-ups are prime examples of career-altering victories that changed division trajectories and have gone down in UFC history.
Serra vs. St-Pierre
One of the biggest upsets of all time came at UFC 69, when the huge underdog Matt Serra challenged the dominant welterweight king Georges St-Pierre. In came Serra, who won The Ultimate Fighter 4 and was given little chance against St-Pierre, a man many had perceived as the best pound-for-pound fighter on the planet.