Jamaican sprinter Usain Bolt

Associated Press
World-record holder Usain Bolt reacts after loosing to fellow countryman Yohan Blake the 100m final at Jamaica's Olympic trials in Kingston, Jamaica, Friday, June 29, 2012. Blake pulled a stunner finishing in 9.75 seconds to upset Bolt by 0.11 seconds. (AP Photo/Collin Reid)

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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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