U.S. sprinter Tyson Gay

Associated Press
FILE - In this Saturday, May 19, 2013 file photo, Asafa Powell of Jamaica, center, competes with Nesta Carter of Jamaica, left, and Kim Collins of Saint Kitts, right, during the men's 100 meter at the Diamond League track and field competition in Shanghai, China. Former 100-meter world-record holder Asafa Powell and Jamaican teammate Sherone Simpson have each tested positive for banned stimulants, according to their agent. Paul Doyle told The Associated Press on Sunday, July 14, 2013 that they tested positive for the stimulant oxilofrine at the Jamaican championships and were just recently notified. The news came the same day that American 100-meter record holder Tyson Gay revealed that he also failed a drug test. (AP Photo/Eugene Hoshiko, 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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