2016 Rio Olympics - Athletics - Semifinal - Men's 100m Semifinals - Olympic Stadium - Rio de Janeiro, Brazil - 14/08/2016. Usain Bolt (JAM) of Jamaica looks at Andre De Grasse (CAN) of Canada as they compete. REUTERS/Kai Pfaffenbach
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.