Returning Gatlin warns of defeat to Bolt and Gay

Sprinter Justin Gatlin prepares to run from the blocks during practice in Marietta, Georgia January 18, 2010. Former Olympic and world champion Gatlin warned kingpins Usain Bolt and Tyson Gay to brace for a possible defeat when the U.S. sprinter returns from a four-year doping suspension this year. [Photo/Agencies]