UFC 137: Georges St. Pierre vs. Nick Diaz, 5-Fight Main Card Set

UFC 137 takes place at the Mandalay Bay Events Center in Las Vegas on October 29.

The pay-per-view event is headlined by welterweight champion Georges St. Pierre (22-2) and former Strikeforce welterweight champion Nick Diaz (25-7).

Diaz relinquished his welterweight championship in order to face St. Pierre for the UFC title.

Additionally, former lightweight and welterweight champion B.J. Penn (16-7-2) co-headlines the event opposite Carlos Condit (27-5).

A pair of heavyweight fights also join the aforementioned welterweight bouts as The Ultimate Fighter season 10 winner Roy Nelson (15-6) faces Mirko "Cro Cop" Filipovic (27-9-2) and Cheick Kongo (16-6-2) steps in against Matt Mitrione (5-0).

Rounding out the main card action will be featherweight newcomer Hatsu Hioki (24-4-2) testing his skills on American soil against George Roop (12-7-1).

MMAjunkie.com recently reported that the event will receive two fights courtesy of a "UFC Prelims" slot on Spike TV.

Preliminary Card:

• Donald Cerrone vs. Dennis Siver

• Tyson Griffin vs. Bart Palaszewski

• Tim Credeur vs. Brad Tavares

• Jeff Curran vs. Scott Jorgensen

• Brandon Vera vs. Elliot Marshall

• Ramsey Nijem vs. Danny Downes

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