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BEIJING, CHINA - AUGUST 23: Usain Bolt of Jamaica is congratulated by Justin Gatlin of the United States after winning gold in the Men's 100 metres final during day two of the 15th IAAF World Athletics Championships Beijing 2015 at Beijing National Stadium on August 23, 2015 in Beijing, China. (Photo by Ian Walton/Getty Images)

BEIJING, CHINA - AUGUST 23:  Usain Bolt of Jamaica is congratulated by Justin Gatlin of the United States after winning gold in the Men's 100 metres final during day two of the 15th IAAF World Athletics Championships Beijing 2015 at Beijing National Stadium on August 23, 2015 in Beijing, China.  (Photo by Ian Walton/Getty Images)