UFC 137 Results, BJ Penn Retires from MMA

MMA fans didn't get to see current welterweight champion Georges St. Pierre defend his belt against Carlos Condit at UFC 137, but the main event between BJ Penn and Nick Diaz definitely made up for it. Here are the results of the UFC 137 fight card held on Oct. 29, at the Mandalay Bay Events Center in Las Vegas, Nevada.

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