TOPSHOTS Jamaica's Usain Bolt celebrates after winning the100 metres final at the 2013 IAAF World Championships at the Luzhniki stadium in Moscow on August 11, 2013. Bolt timed a season's best 9.77 seconds, with American Justin Gatlin claiming silver in 9.85sec and Nesta Carter, also of Jamaica, taking bronze in 9.95sec. AFP PHOTO / LOIC VENANCE