Jamaican sprinter Usain Bolt

Associated Press
Jamaica's Usain Bolt, center, crosses the finish line to win 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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