B.J. Penn vs. Nick Diaz, Matt Mitrione vs. Cheick Kongo and Roy Nelson vs. Mirko Cro Cop; Countdown to UFC 137 focuses on these three bouts which headline Saturday’s Pay-Per-View card at the Mandalay Bay Events Center in Las Vegas, Nev. If this Countdown show doesn’t get you pumped for this card, nothing will.

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