One of the great things about MMA is that a fight can end in an instant. When dissecting fights you'll always find the phrase "a puncher's chance" when describing a total underdog's chances of victory.
When a fighter who's widely predicted to lose, it adds a bit of chaos into the mix. Although many people (along with their bets) would love for fights to go according to plan, there are a few occasions where the underdog triumphs over the dominant foe.
Just as the phrase "on any given Sunday" applies to a football team's chance at victory, on any given night—once the cage door closes—a fighter can win. Whether it be by a stroke of luck or a dominant performance, all of these fighters were able to overcome the odds and have their hands raised despite many in the MMA world predicting their loss.
Note: These are in chronological order and are not ranked.