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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Tags: ufc, mma, bj-penn, nick-diaz
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