Jamaican sprinter Usain Bolt

Associated Press
FILE - This Sept. 4, 2011 file photo shows Jamaica's Usain Bolt celebrating after winning the men's 4x100 relay final,  and setting a world record,  at the World Athletics Championships in Daegu, South Korea. Any talk of the Olympics has to start with the flashy Jamaican sprinter. His performance in Beijing four years ago was magical.  (AP Photo/Lee Jin-man, FIle)

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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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