![UFC 137: Penn vs. Diaz Poster](https://image.tmdb.org/t/p/w500//m6Uw8y55wCl7lqTRljXItRVQOo0.jpg)
UFC 137: Penn vs. Diaz
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October 29, 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.