So, who is going to win the UFC 137 main event between B.J. Penn vs. Nick Diaz on Oct. 29 in Las Vegas?
Find out from Stephan Bonnar, Wanderlei Silva, Manny Gamburyan, Tyson Griffin, Duane Ludwig, Anthony Njokuani, Rafael Cordeiro and Phil Baroni as the "pros" all weigh in on this Saturday night's headliner.
Props: MMA Interviews
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