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Jamaica's Usain Bolt leaves the stadium after the medals ceremony for the men's 4x100-mter final during the athletics competitions of the 2016 Summer Olympics at the Olympic stadium in Rio de Janeiro, Brazil, Saturday, Aug. 20, 2016. (AP Photo/Matt Dunham)

Jamaican sprinter Usain Bolt

The Jamaican sprinter and three-time Olympic gold medalist will be one of the biggest names to watch at the London Games.