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.
Nick Diaz
Self
B.J. Penn
Cheick Kongo
Matt Mitrione
Roy Nelson
Mirko Filipović
Scott Jorgensen
Jeff Curran
Hatsu Hioki
George Roop
Donald Cerrone
Dennis Siver
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