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Boxer Sergio Martinez (R) of Argentina reacts to the cheers of fans as he arrives for an official weigh-in at the Wynn Las Vegas Resort in Las Vegas, Nevada Sept. 14, 2012. Martinez will challenge WBC middleweight champion Julio Cesar Chavez Jr., son of boxing legend Julio Cesar Chavez, at the Thomas & Mack Center in Las Vegas September 15.

Steve Marcus