UFC 137: Penn vs. Diaz 2011
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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.
- Released: 2011-10-29
- Runtime: 171 minutes
- Genre:
- Stars: Nick Diaz, B.J. Penn, Cheick Kongo, Matt Mitrione, Roy Nelson
- Director:
