10. Frankie Edgar vs. Gray Maynard

UFC 125

These two lightweights traded punishment in a way that no one saw coming—conventional wisdom had defending title-holder Edgar using his superior quickness to dominate Maynard. But "The Bully" did not back down; in fact, Maynard spent much of the fight on the offensive, and more than once escaped sure doom to earn a draw. This has gone on to become one of the UFC's premier rivalries