Jamaican sprinter Usain Bolt

Associated Press
Jamaica's Usain Bolt dances after winning his third gold medal, in the men's 4x100-meter relay, at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Sunday, Aug. 18, 2013.(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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