Marco Antonio Barrera, Juan Manuel Marquez, Jay Nady

Referee Jay Nady holds back Marco Antonio Barrera, of Mexico, after struck the crouching Juan Manuel Marquez, foreground, of Mexico, in the seventh round of a WBC 130-pound championship boxing match Saturday, March 17, 2007, in Las Vegas. Barrera had connected with a right to the chin that left Marquez crouched with one glove on the canvas, but Nady ruled it a slip. Marquez later conceded that he had been knocked down. When Barrera stepped in and swung at the crouching Marquez again, Nady subtracted a point from the champion. That meant Barrera lost the round 10-8 instead of winning it. (AP Photo/Jae C. Hong)