Jamaican sprinter Usain Bolt

Associated Press
Jamaica's Usain Bolt competes in a men's 200-meter heat at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Friday, Aug. 16, 2013. (AP Photo/Ivan Sekretarev)

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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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