FILE - In this Aug. 19, 2016 file photo, Jamaica's Usain Bolt celebrates winning the gold medal in the men's 4x100-meter relay final during the athletics competitions of the 2016 Summer Olympics at the Olympic stadium in Rio de Janeiro, Brazil. Bolt and his All Stars completed a clean sweep of the inaugural Nitro Athletics series on Saturday, Feb. 11, 2017 with Bolt winning the 150-meter race in his only solo appearance of the three-night meet. (AP Photo/Martin Meissner, File)
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.