Jamaican sprinter Usain Bolt

Associated Press
Jamaica's Usain Bolt, center, reacts after winning ahead of United States' Justin Gatlin, right, and Britain's Dwayne Chambers in the men's 4x100-meter relay final at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Sunday, Aug. 18, 2013. (AP Photo/Martin Meissner)

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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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