6. TJ Dillashaw vs. Renan Barao UFC 173
UFC 173 was an event hampered by injuries. Originally the main event was supposed to be for the middleweight championship, with Chris Weidman defending against Vitor Belfort, however Nevada banned testosterone replacement therapy in the weeks leading up to the event and Belfort needed more time to adjust. With Belfort out, Lyoto Machida stepped in as his replacement, but then Weidman was forced to withdraw due to injury.
Finally the UFC decided that Renan Barao would defend the bantamweight championship against Raphael Assuncao. Then Assuncao had to withdraw due to injury and TJ Dillashaw, who was scheduled to fight earlier on the card, was moved up into the main event.
In shocking fashion TJ dominated Barao for the whole fight before knocking him out in the final round to take the championship. The win just about made Joe Rogan explode.
