Jamaican sprinter Usain Bolt

Associated Press
Jamaica's Usain Bolt, right, goes to cross the finish line ahead of United States' Justin Gatlin, second from right, and Germany's Martin Keller in the women's 4x100-meter relay final 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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