UFC 137: Penn vs. Diaz takes place October 29 from Las Vegas, Nevada live on pay-per-view. Along with Penn vs. Diaz, Matt Mitrione will meet Cheick Kongo in the co-main event, and heavyweights Roy Nelson and Mirko "CroCop" Filpovic will face off.
UFC 137 : B.J. Penn vs. Nick Diaz – 3 rounds, welterweights
At Las Vegas (UFC 137, Spike TV, Pay-Per-View)
Fight date : October 29 , 2011
