Jamaican sprinter Usain Bolt

Associated Press
Usain Bolt of Jamaica, center, wins the Men's 200m ahead of Warren Weir of Jamaica, left, and Christophe Lemaitre of France during the Athletics Diamond League meeting at Stade de France stadium in Saint Denis north of Paris, Saturday July 6, 2013. (AP Photo/Michel Euler)

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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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