Fans watch a local soccer match between Shanghai SIPG Football Club and Shanghai Greenland Shenhua Football Club, at Hongkou Football Stadium, Shanghai, China, July 17, 2016. REUTERS/David Stanway

Athletes from South Sudan, part of the refugee athletes who qualified for the 2016 Rio Olympics, (L-R) Paulo Amotun Lokoro of 1500m, Rose Nathike Lokonyen of 800m, Yiech Pur Biel of 800m, Anjelina Nada Lohalith of 1500m and James Nyang Chiengjiek of 400m, pose for a photograph after a training session at their camp in Ngong township near Kenya's capital Nairobi, June 9, 2016. REUTERS/Thomas Mukoya

Athletes from South Sudan, part of the refugee athletes qualified for the 2016 Rio Olympics, (L-R) Paulo Amotun Lokoro of 1500m, Rose Nathike Lokonyen of 800m, Yiech Pur Biel of 800m, run along a dusty road during a training session at their camp in Ngong township near Kenya's capital Nairobi, June 9, 2016. REUTERS/Thomas Mukoya

Rose Nathike Lokonyen and James Nyang Chiengjiek, refugees from South Sudan, part of the refugee athletes who qualified for the 2016 Rio Olympics, stretch during a training session at their camp in Ngong township near Kenya's capital Nairobi, June 9, 2016. REUTERS/Thomas Mukoya

A view of one of the blocks of apartments where Australian athletes competing in the Rio 2016 Olympic Games are supposed to stay in the Olympic Village in Rio de Janeiro, Brazil, July 24, 2016. REUTERS/Pilar Olivares

Britain Tennis - Wimbledon - All England Lawn Tennis & Croquet Club, Wimbledon, England - 27/6/16 France's Gael Monfils in action against France's Jeremy Chardy REUTERS/Tony O'Brien

An aerial view shows a man working at the 2016 Rio Olympics golf venue in Rio de Janeiro, Brazil, July 16, 2016. Picture taken July 16, 2016. REUTERS/Ricardo Moraes

An aerial view shows the 2016 Rio Olympics golf venue in Rio de Janeiro, Brazil, July 16, 2016. Picture taken July 16, 2016. REUTERS/Ricardo Moraes