Las Vegas Sun - Photograph : UFC 137 - Diaz vs. Penn

September 19, 2017

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B.J. Penn hits Nick Diaz with a left during their bout at UFC 137 on Saturday, Oct. 29, 2011, at the Mandalay Bay Events Center. Diaz won by unanimous decision, and Penn announced his retirement after the fight.

Sam Morris

B.J. Penn hits Nick Diaz with a left during their bout at UFC 137 on Saturday, Oct. 29, 2011, at the Mandalay Bay Events Center. Diaz won by unanimous decision, and Penn announced his retirement after the fight.