Georges St-Pierre batters B.J. Penn from the top position during their UFC welterweight title fight Saturday night in Las Vegas. (Eric Jamison / Associated Press)
Georges St-Pierre lands a right cross to the head of B.J. Penn during their UFC welterweight championship fight Saturday night in Las Vegas. (Eric Jamison / Associated Press)
Georges St-Pierre improved his record to 18-2 with a dominating performance Saturday night against B.J. Penn, who is on canvas pinned against the octagon. (Eric Jamison / Associated Press)
Georges St-Pierre lands a left against B.J. Penn during their UFC welterweight title bout Saturday night in Las Vegas. (Eric Jamison / Associated Press)
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Georges St-Pierre celebrates his fourth-round technical knockout of B.J. Penn in their UFC welterweight title fight Saturday night in Las Vegas. (Eric Jamison / Associated Press)
Referee Yves Lavigne ends the fight as Thiago Silva loses by technical knockout to Lyoto Machida (not pictured) in the first round of their UFC light-heavyweight bout Saturday night in Las Vegas. Machida improved to 14-0 while handing Silva his first loss in 14 fights. (Eric Jamison / Associated Press)
Referee Yves Lavigne tries to separate Lyoto Machida from Thiago Silva in the first round of their UFC light-heavyweight bout Saturday night in Las Vegas. (Eric Jamison / Associated Press)
Lyoto Machida has the upper hand against Thiago Silva during their February 2009 UFC light-heavyweight fight in Las Vegas. (Eric Jamison / Associated Press)
