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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.[2]

Main card
Featherweight bout:  Hatsu Hioki vs.  George Roop

Bantamweight bout:  Scott Jorgensen vs.  Jeff Curran

Heavyweight bout:  Mirko Filipovic vs.  Roy Nelson

Heavyweight bout:  Cheick Kongo vs.  Matt Mitrione

Welterweight bout:  BJ Penn vs.  Nick Diaz