U.S. sprinter Tyson Gay

Associated Press
FILE - In this Aug. 16, 2009 file photo, United States' Tyson Gay who placed second celebrates with the U.S. flag after the Men's 100m final during the World Athletics Championships in Berlin. Gay said Sunday, July 14, 2013 that he tested positive for a banned substance and that he will pull out of the world championships next month in Moscow. (AP Photo/Anja Niedringhaus, 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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