January 31, 2009 - Two champions at the top of their game collide, as UFC welterweight champion George St-Pierre defends his crown against lightweight titleholder BJ Penn in an epic rematch that headlines UFC 94 at the MGM Grand Garden Arena in Las Vegas. In the co-featured bout, Lyoto "The Dragon" Machida battles knockout artist Thiago Silva in a clash of unbeaten light heavyweight contenders, and the explosive action doesn't stop there, as Clay Guida, Nate Diaz, Jon Jones, Stephan Bonnar, and Jon Fitch all return to the Octagon for a night of fights you won't forget.