UFC 137: Penn vs. Diaz
UFC 137: Penn vs. Diaz

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.

casts
Nick DiazNick Diaz
B.J. PennB.J. Penn
Cheick KongoCheick Kongo
Matt MitrioneMatt Mitrione
Roy NelsonRoy Nelson
UFC 137: Penn vs Diaz - Extended Preview
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