Usain Bolt

Usain Bolt of Jamaica sits on a bench with Justin Gatlin of U.S. after the men's 200 metres final during the 15th IAAF World Championships at the National Stadium in Beijing...Usain Bolt of Jamaica (L) sits on a bench with Justin Gatlin of U.S. after the men's 200 metres final during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. Bolt finished in first place and Gatlin in second place

Kai Pfaffenbach/Reuters

Usain Bolt of Jamaica sits on a bench with Justin Gatlin of U.S. after the men’s 200 metres final during the 15th IAAF World Championships at the National Stadium in Beijing, China on Thursday. Bolt finished in first place and Gatlin in second place

Bolt poses for a portrait in New York...Usain Bolt poses for a portrait in New York June 11, 2015. Sprint supremo Bolt says he is taking his time building up to August's Beijing world championships and is looking forward to an explosive showdown there against American Justin Gatlin. REUTERS/Lucas Jackson

Lucas Jackson/Reuters

Usain Bolt poses for a portrait in New York. Sprint supremo Bolt says he is taking his time building up to August’s Beijing world championships and is looking forward to an explosive showdown there against American Justin Gatlin 

Bolt of Jamaica crosses the finish line ahead of Williams of Britain to win their men's 200 metres heat during the IAAF World Athletics Championships in Moscow

Fabrizio Bensch/Reuters

Usain Bolt of Jamaica (bottom) crosses the finish line ahead of Delanno Williams of Britain to win their men’s 200 metres heat during the IAAF World Athletics Championships at the Luzhniki stadium in Moscow, Russia, on Friday