UFC 137: Penn vs. Diaz was a mixed martial arts event held by the Ultimate Fighting Championship on October 29, 2011 at Mandalay Bay Events Center in Las Vegas, Nevada.

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Main Cast: Nick Diaz, B.J. Penn, Cheick Kongo, Matt Mitrione, Roy Nelson, Mirko Filipović, Scott Jorgensen, Jeff Curran, Hatsu Hioki, George Roop

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