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Nick Diaz pins BJ Penn against the fence
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Nick Diaz pins BJ Penn against the fence during their welterweight bout at UFC 137 in Las Vegas. Diaz won by unanimous decision. (Oct. 29, 2011)(Credit: AP )

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UFC 137: Diaz vs. Penn

Nick Diaz defeated B.J. Penn by unanimous decision in the main event at UFC 137 in Las Vegas.