Nate Marquardt was supposed to be a shoo-in for a middleweight title shot... until he faced motivated underdog Chael Sonnen at UFC 109 in an unforgettable Fight of the Night.

Chael Sonnen recounts some of the harrowing experiences he had growing up on the mean streets of West Linn, Oregon.

Champion vs. icon, but who's who? The Silva vs. Sonnen rivalry continues to build steam with a shoulder shot at UFC 148 weigh-ins.

There are fighters, there are champions, and then there is Anderson Silva.

It was the biggest beatdown of Silva's career, and the biggest comeback in UFC history. Watch all 4.5 rounds of Silva vs. Sonnen at UFC 117.

Chael Sonnen sounds off as Dana White and middleweight champion Anderson Silva try not to laugh at the UFC 148 pre-fight press conference.

"It's like skydiving at a rock concert." Anderson, Chael, Tito and Forrest wax poetic for the media at the UFC® 148 open workouts.

A fired-up Anderson Silva explains why he expects his fight with Chael Sonnen at UFC® 148 to be an historic and epic event.

The middleweight champion is eager to get back into the Octagon with his nemesis and is not mincing his words when it comes to hip opinion on Chael.

Anderson Silva has fired back with his own trash talk and with less than two weeks left before the fight, this rivalry has reached an all time high. Watch the rematch between Anderson Silva and Chael Sonnen.

Chad Mendes, Cody McKenzie, Mike Easton and Ivan Menjivar talk strategies, friendships, and stealing the show at UFC® 148.

Watch the epic rematch between Anderson Silva and Chael Sonnen as the two faced off at UFC 148. Silva returns to the Octagon to take on Derek Brunson at UFC 208.

UFC 152 star Michael Bisping was mic'd up Octagon-side as Anderson Silva fought Chael Sonnen at UFC® 148. He was joined byStrikeforce Women's Bantamweight Champion Ronda Rousey, in this episode of Full Blast.

Anderson Silva and Chael Sonnen, Forrest Griffin and Tito Ortiz - Four UFC® superstars, two epic rivalries settled at UFC® 148.

Leg kicks make the difference in this battle between big-name brawler Rampage Jackson and scrappy TUF winner Forrest Griffin at UFC 86.

Bantamweight powerhouse Mike "The Hulk" Easton shows you what he's doing to prepare for his fight with Ivan Menjivar at UFC® 148.

International Fight Week in Las Vegas continues on Thursday with a press conference, open workouts, a pool party and a downtown pub crawl.

Being a fighter isn't about getting into the Octagon. It's about staying in the Octagon.

Listen to the entire UFC 148 media call w/ Chael Sonnen, Anderson Silva, Forrest Griffin, Tito Ortiz, and Dana White.

Anderson Silva and Chael Sonnen are preparing for an epic grudge match at UFC 148 - go inside their training camps and mindsets in real time as they prepare to wage war again, and this time erase all questions.

Melvin Guillard vs. Fabricio Camoes, and Costa Philippou vs. Riki Fukuda - two fights that are guaranteed to bring excitement at UFC® 148.

At UFC® 117, Chael Sonnen almost became the first man to defeat middleweight champion Anderson Silva inside the Octagon™. Nearly two years later, they will meet again at UFC® 148 in one of the most highly anticipated rematches of all time.

Anderson Silva w/ Ed Soares translating begins to fire back at Chael Sonnen's pre-fight trash talk.