U.S. sprinter Tyson Gay

Associated Press
FILE - In a May 25, 2013, file photo Tyson Gay reacts after winning the Men's 100m during the IAAF Diamond League Grand Prix competition in New York. Gay was informed Friday July 12, 2013, he has tested positive for a banned substance and says he will pull out of the world championships next month in Moscow. (AP Photo/John Minchillo/file)

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After a lackluster performance at the 2008 Beijing Olympics, American sprinter Tyson Gay will be looking for redemption on the track at the London Games. -- By Armando Botello II

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