Jamaican sprinter Usain Bolt

Associated Press
Jamaican athlete Usain Bolt and US sprinter Allyson Felix pose for photographs with their trophies during the IAAF´s Athlete of the Year Award marking its centenary in Barcelona, Saturday, Nov. 24, 2012.  (AP Photo/Manu Fernandez)

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The Jamaican sprinter and three-time Olympic gold medalist will be one of the biggest names to watch at the London Games.

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