Tags: Mixed Martial Arts Event.
UFC 137: Penn vs. Diaz was a mixed martial arts (MMA) pay-per-view event held by the Ultimate Fighting Championship on October 29 2011 at Mandalay Bay Events Center in Paradise Nevada.
Tags: Mixed Martial Arts Event.
UFC 137: Penn vs. Diaz was a mixed martial arts (MMA) pay-per-view event held by the Ultimate Fighting Championship on October 29 2011 at Mandalay Bay Events Center in Paradise Nevada.
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