Jamaican sprinter Usain Bolt

Associated Press
Sunday, Aug. 11, 2013: Jamaica's Usain Bolt gestures skyward as rain falls before the men's 100-meter final at the World Athletics Championships in the Luzhniki stadium in Moscow. (AP Photo/Matt Dunham)

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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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