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LAS VEGAS - JULY 31: Juan Diaz (L) and WBA/WBO lightweight champion Juan Manuel Marquez battle in the third round of their bout at the Mandalay Bay Events Center July 31, 2010 in Las Vegas, Nevada. Marquez retained his WBA and WBO lightweight championship belts with a unanimous-decision victory over Diaz. (Photo by Ethan Miller/Getty Images)

LAS VEGAS - JULY 31:  Juan Diaz (L) and WBA/WBO lightweight champion Juan Manuel Marquez battle in the third round of their bout at the Mandalay Bay Events Center July 31, 2010 in Las Vegas, Nevada. Marquez retained his WBA and WBO lightweight championship belts with a unanimous-decision victory over Diaz.  (Photo by Ethan Miller/Getty Images)