Main eventing the card is the third fight between UFC lightweight champion Frankie Edgar and challenger Gray Maynard. Maynard became the only man to beat Edgar back in 2008. The two men rematched this January and battled to a draw in what many consider to be one of the best fights in UFC history.
The co-featured bout of the event sees Kenny Florian look to finally win a UFC championship as he faces featherweight champion Jose Aldo. Florian has lost in two attempts to win the lightweight championship and dropped to featherweight to look for another chance at the gold.
Also on the PPV main card, Brian Stann faces the returning Chael Sonnen in middleweight action, Leonard Garcia and Nam Phan rematch to settle the score after their exciting first battle and Melvin Guillard looks to establish himself as a title contender against Joe Lauzon.
That doesn't even get into the great Facebook and Spike TV undercard action in what could be one of the best cards in UFC history.
Live video starts at 5 p.m. ET.