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'Countdown' to UFC 137 full videos for 'Penn vs Diaz'

UFC 137: "Penn vs. Diaz" is right around the corner, emanating from the Mandalay Bay Events Center in Las Vegas, Nevada, on Oct. 29, 2011.

B.J. Penn vs. Nick Diaz will serve as the replacement main event after the fight between Georges St. Pierre vs. Carlos Condit was recently scrapped because a knee injury to "Rush." The "Countdown" video above aired earlier this week on Spike TV to promote the pay-per-view (PPV) event this weekend. It featured commentary from Cesar Gracie, Matt Hughes and others who weigh in on the 170-pound clash.

Check out the segment from the UFC 137 "Countdown" show that features the co main event participants, Matt Mitrione vs. Cheick Kongo, as well as another heavyweight scrap, Mirko Filipovic vs. Roy Nelson, after the jump:


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