Jamaican sprinter Usain Bolt

Associated Press
Usain Bolt of Jamaica reacts after he wins the Men's 200m 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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