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Scott Jorgensen slams Jeff Curran to the mat (Credit: AP)

Scott Jorgensen slams Jeff Curran to the mat during a mixed martial arts bantamweight bout. (Oct. 29, 2011)

UFC 137: Diaz vs. Penn

Nick Diaz defeated B.J. Penn by unanimous decision in the main event at UFC 137 in Las Vegas.

Nick Diaz pins BJ Penn against the fence
(Credit: AP )

Nick Diaz pins BJ Penn against the fence during their welterweight bout at UFC 137 in Las Vegas. Diaz won by unanimous decision. (Oct. 29, 2011)

Nick Diaz punches BJ Penn during their welterweight
(Credit: AP )

Nick Diaz punches BJ Penn during their welterweight bout at UFC 137 in Las Vegas. Diaz won by unanimous decision. (Oct. 29, 2011)

Nick Diaz, facing camera, and BJ Penn grapple
(Credit: AP )

Nick Diaz, facing camera, and BJ Penn grapple during their welterweight bout at UFC 137 in Las Vegas. Diaz won by unanimous decision. (Oct. 29, 2011)

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BJ Penn, right, and Nick Diaz fight in
(Credit: AP)

BJ Penn, right, and Nick Diaz fight in a welterweight bout at UFC 137 in Las Vegas. Diaz won by unanimous decision. (Oct. 29, 2011)

Nick Diaz, right, throws a punch at BJ
(Credit: AP )

Nick Diaz, right, throws a punch at BJ Penn during their welterweight bout at UFC 137 in Las Vegas. Diaz won by unanimous decision. (Oct. 29, 2011)

BJ Penn, left, punches Nick Diaz during their
(Credit: AP )

BJ Penn, left, punches Nick Diaz during their welterweight bout at UFC 137 in Las Vegas. Diaz won by unanimous decision. (Oct. 29, 2011)

BJ Penn, left, punches Nick Diaz during their
(Credit: AP)

BJ Penn, left, punches Nick Diaz during their welterweight bout at UFC 137 in Las Vegas. Diaz won by unanimous decision. (Oct. 29, 2011)

Nick Diaz, right, punches BJ Penn during a
(Credit: AP)

Nick Diaz, right, punches BJ Penn during a mixed martial arts welterweight bout in Las Vegas. (Oct. 29, 2011)

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Nick Diaz, right, throws a punch at BJ
(Credit: AP Photo/Isaac Brekken)

Nick Diaz, right, throws a punch at BJ Penn during a mixed martial arts welterweight bout, Saturday, Oct. 29, 2011, in Las Vegas. Diaz won by unanimous decision. (AP Photo/Isaac Brekken)

Nick Diaz, right, punches BJ Penn during their
(Credit: AP)

Nick Diaz, right, punches BJ Penn during their welterweight bout at UFC 137 in Las Vegas. Diaz won by unanimous decision. (Oct. 29, 2011)

Cheick Kongo, of France, right, takes a punch
(Credit: AP )

Cheick Kongo, of France, right, takes a punch from Matt Mitrione during a heavyweight bout at UFC 137 in Las Vegas. Kongo won by unanimous decision. (Oct. 29, 2011)

Cheick Kongo, right, punches Matt Mitrione in a
(Credit: AP)

Cheick Kongo, right, punches Matt Mitrione in a UFC 137 heavyweight bout in Las Vegas. Kongo won by unanimous decision. (Oct. 29, 2011)

Mirko Cro Cop, of Croatia, kicks Roy Nelson
(Credit: AP)

Mirko Cro Cop, of Croatia, kicks Roy Nelson during a UFC 137 heavyweight fight. Nelson won by TKO in the third round. (Oct. 29, 2011)

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Roy Nelson. top, punches Mirko Cro Cop, of
(Credit: AP Photo/Isaac Brekken)

Roy Nelson. top, punches Mirko Cro Cop, of Croatia, during a mixed martial arts heavyweight bout, Saturday, Oct. 29, 2011, in Las Vegas. Nelson won by TKO. (AP Photo/Isaac Brekken)

Roy Nelson celebrates his victory over Mirko Cro
(Credit: AP Photo/Isaac Brekken)

Roy Nelson celebrates his victory over Mirko Cro Cop, of Croatia, following a mixed martial arts heavyweight bout, Saturday, Oct. 29, 2011, in Las Vegas. Nelson won by TKO. (AP Photo/Isaac Brekken)

Donald Cerrone, left, kicks Dennis Siver, of Germany,
(Credit: AP Photo/Isaac Brekken)

Donald Cerrone, left, kicks Dennis Siver, of Germany, during a mixed martial arts lightweight bout, Saturday, Oct. 29, 2011, in Las Vegas. Cerrone won by tap out. (AP Photo/Isaac Brekken)

Bart Palaszewski, right, kicks Tyson Griffin in the
(Credit: AP )

Bart Palaszewski, right, kicks Tyson Griffin in the first round of their UFC 137 featherweight bout. Palaszewski won by TKO. (Oct. 29, 2011)

Bart Palaszewski celebrates his TKO victory over Tyson
(Credit: AP Photo/Isaac Brekken)

Bart Palaszewski celebrates his TKO victory over Tyson Griffin during a mixed martial arts featherweight bout, Saturday, Oct. 29, 2011, in Las Vegas. (AP Photo/Isaac Brekken)

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Scott Jorgensen slams Jeff Curran to the mat
(Credit: AP)

Scott Jorgensen slams Jeff Curran to the mat during a mixed martial arts bantamweight bout. (Oct. 29, 2011)

George Roop, right, punches Hatsu Hioki, of Japan,
(Credit: AP Photo/Isaac Brekken)

George Roop, right, punches Hatsu Hioki, of Japan, during a mixed martial arts featherweight bout Saturday, Oct. 29, 2011, in Las Vegas. Hioki won by split decision. (AP Photo/Isaac Brekken)

Hatsu Hioki, of Japan, right, punches George Roop
(Credit: AP Photo/Isaac Brekken)

Hatsu Hioki, of Japan, right, punches George Roop during a mixed martial arts featherweight bout, Saturday, Oct. 29, 2011, in Las Vegas. Hioki won by split decision. (AP Photo/Isaac Brekken)

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