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.
Nick Diaz
as Self
B.J. Penn
as Self
Cheick Kongo
as Self
Matt Mitrione
as Self
Roy Nelson
as Self
Mirko Filipović
as Self
Scott Jorgensen
as Self
Jeff Curran
as Self
Hatsu Hioki
as Self
George Roop
as Self
Donald Cerrone
as Self
Dennis Siver
as Self
