UFC 137 Preview: Penn vs Diaz - Comeback or Come Up?

Is the Penn mightier than the Diaz?

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UFC 137 BJ Penn's beaten some of the sport's most decorated fighters, but he's faltered of late. Nick Diaz is a tough fighter everyone knows is good, but no one knows how good he is. Cue the Dr. Dre. This one's going to be explosive. Order the fights

By Orlando Lima @limachips 

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