UFC legends Nick Diaz and BJ Penn throw down inside the Octagon at UFC 137. Diaz takes on one of MMA's greatest fighters in Anderson Silva during the main event at UFC 183 in Las Vegas, Nevada.

He's wild, unpredictable, talented, and THEN he gets inside the Octagon. See the early days of Nick Diaz' now-signature scrapping style in Diaz vs. Robbie Lawler from UFC 47.

A match between two of the best welterweights in the world doesn't get more exciting than this as Nick Diaz takes on BJ Penn.

Commentator extraordinaire Joe Rogan breaks down Matt Mitrione vs. Cheick Kongo, and BJ Penn vs. Nick Diaz.

Nick Diaz earns a Fight of the Night bonus after battering BJ Penn en route to a unanimous decision victory, sending Penn into retirement in the process. Hear his feelings on the fight, and what's next for the former Strikeforce champ.

After a three-round battle, Cheick Kongo hands Matt Mitrione his first career loss. The French striker gives his thoughts on the co-main event of UFC 137.

After grinding out a decision against a tougher-than-expected George Roop, Hatsu Hioki talks about the gameplan for his UFC debut.

"The bloodlust took over." Bart Palaszewski continues the streak of successful UFC debuts by WEC imports, KO'ing Tyson Griffin in the first round. Hear what "Bartimus" credits for his impressive performance.

TUF finalist Ramsey Nijem makes the drop to lightweight, and turns in an impressive decision over a game Danny Downes. Hear what he had to say about his new home at 155 lbs.

Francis Carmont makes training partner Georges St-Pierre proud, turning in a dominating performance against TUF vet Chris Camozzi. The man called "Limitless" gives his thoughts on tghe fight.

Clifford Starks stays undefeated in his Octagon debut, defeating fellow newcomer Dustin Jacoby. Hear his thoughts on winning the opening bout of UFC 137.

UFC® 137 Prelim Fight: Brandon Vera vs Eliot Marshall

UFC® 137 Prelim Fight: Chris Camozzi vs Fracis Carmont

UFC® 137 Prelim Fight: Dustin Jacoby vs Clifford Starks

UFC® 137 Prelim Fight: Tyson Griffin vs. Bart Palaszewski

Liddell and Rampage complete their trilogy... on UFC Undisputed 3.

Welterweight champion Georges St-Pierre breaks down the UFC 137 main event between BJ Penn and Nick Diaz.

UFC 137 headliners BJ Penn and Nick Diaz come face to face (and nearly fist to fist) at the official weigh-in.

Mirko Cro Cop talks about the 37 reasons he might be done fighting... but not before beating up Pat Barry for personal reasons.

Headliners BJ Penn and Nick Diaz both show their relaxed, respectful sides at the UFC 137 pre-fight press conference, leaving Matt Mitrione to do all the instigating.

The best of the rest are letting their words do the fighting... for now. Watch the preview here and watch the fights on Saturday on Facebook FOR FREE!

The legendary Mirko Cro Cop shows off his evolution as a mixed martial artist, choking out Pat Barry in the final minute of their fight at UFC 115.

Watch the UFC 137 Pre-fight Press Conference from the Brooklyn Bridge at New York New York Hotel and Casino.

The fighters make time for the media, and Dana makes time for the fans at the UFC 137 press conference at New York, NY Hotel and Casino.

The best of the best talk and walk (and workout) during the open workouts. Hear what everyone is saying before UFC 137.

Locked and loaded and ready to fight! Dynamic strikers Donald Cerrone and Dennis Siver prepare for an all-out war, as UFC vet Tyson Griffin welcomes the WEC's Bart Palaszewski to the Octagon.

The cerebral fighter, Danny Downes takes us on a journey full of training, humor, and dairy product education.

Get a tour of TUF 13 finalist Ramsey Nijem's living and training quarters at The Pit Elevated in Utah.

Go behind the scenes of UFC 136 before the big event October 29!

Legend BJ "the Prodigy" Penn fights fellow enfant terrible Nick Diaz in the main event of UFC 137, while Matt Mitrione tries to stay undefeated against the fearsome Cheick Kongo.

BJ Penn and Matt Hughes' trilogy of fights is the stuff of MMA legend - now see the first installment from UFC 46 free right here!

Despite dealing with outside distractions during his UFC 137 training camp, former champ BJ Penn has been able to stay focused on his goal: Win, at all costs.

Cheick Kongo is on a quest for UFC® gold, and he doesn't plan to let anyone - including Matt Mitrione - get in his way.

In Matt Mitrione's mind, a victory over Cheick Kongo at UFC 137 is a foregone conclusion. Hear why Mitrione thinks he possesses a skillset unlike anything Kongo has ever seen.

"There can be only one." Former champion BJ Penn says the fans are in for a treat when he faces fellow scrapper Nick Diaz at UFC® 137.

Just scrap! Carlos Condit tries to wrest the belt from GSP's grasp; rebel heroes BJ Penn and Nick Diaz go to war; and heavyweights Cheick Kongo and Matt Mitrione battle inside the Octagon.