Jamaican sprinter Usain Bolt

Associated Press
Jamaica's Usain Bolt listens to the national anthem during the medal ceremony for the men's 200 meters at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Sunday, Aug. 18, 2013. (AP Photo/Alexander Zemlianichenko)

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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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