Athletes compete at the start of the heat 6 of men's 100 metres during the 15th IAAF World Championships...
Athletes (L-R) Hassan Taftian of Iran, Kim Collins of Saint Kitts, Aziz Ouhadi of Morocco, Yazaldes Nascimento of Portugal, Aaron Brown of Canada, Mahamat Goubaye Youssouf of Chad and Justin Gatlin of the U.S. compete at the start of the heat 6 of men's 100 metres during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. REUTERS/Pawel Kopczynski