The following is the official lineup for tonight's UFC 137: "Penn vs. Diaz" event, which emanates from the Mandalay Bay Events Center in Las Vegas, Nevada, and airs live on Facebook.com, Spike TV and pay-per-view television.
Facebook.com Preliminary Fights:
-Cliffard Starks vs. Dustin Jacoby
-Francis Carmont vs. Chris Camozzi
-Danny Downes vs. Ramsey Nijem
-Eliot Marshall vs. Brandon Vera
Spike TV Preliminary Fights:
-Bart Palaszewski vs. Tyson Griffin
-Donald "Cowboy" Cerrone vs. Dennis Siver
-George Roop vs. Hatsu Hioki
-Jeff Curran vs. Scott Jorgensen
-Roy "Big Country" Nelson vs. Mirko "Cro Cop" Filipovic
-Nick Diaz vs. B.J. Penn
Make sure to check out WrestleZone's MMA sister-site, Sherdog.com tonight for the best UFC 137 coverage anywhere on the internet!