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FILE - In this Sunday, Aug. 23, 2015, file photo, United States' Tyson Gay leaves the track after the men's 100-meter final at the World Athletics Championships at the Bird's Nest stadium in Beijing. Olympic sprinter Gay is entered in this week's USA Bobsled National Push Championships, making him the latest track star to give sledding a try. (AP Photo/Mark Schiefelbein, File)

U.S. sprinter Tyson Gay

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