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Athlete Usain Bolt (C) poses for photographers at the world premiere of the film "I am Bolt" in London

Athlete Usain Bolt (C) poses for photographers at the world premiere of the film "I am Bolt" in London, Britain November 28, 2016. REUTERS/Neil Hall

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.