(L-R) Usain Bolt of Jamaica, Su Bingtian of China, Christophe Lemaitre of France, Andre De Grasse of Canada, Julian Reus of Germany (back) and Trayvon Brommell of the US compete in the men's 100 metres semi-final at the 15th IAAF World Championships at the National Stadium in Beijing, China August 23, 2015. [Photo/Agencies]
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