2016 Rio Olympics - Badminton - Men's Singles - Quarterfinals - Riocentro - Pavilion 4 - Rio de Janeiro, Brazil - 17/08/2016. Lin Dan (CHN) of China talks with Srikanth Kidambi (IND) of India over the net after winning their match. REUTERS/Mike Blake

2016 Rio Olympics - Badminton - Men's Singles - Quarterfinals - Riocentro - Pavilion 4 - Rio de Janeiro, Brazil - 17/08/2016. Lin Dan (CHN) of China plays against Srikanth Kidambi (IND) of India. REUTERS/Marcelo del Pozo

2016 Rio Olympics - Badminton - Men's Singles - Quarterfinals - Riocentro - Pavilion 4 - Rio de Janeiro, Brazil - 17/08/2016. Lin Dan (CHN) of China celebrates after winning his match against Srikanth Kidambi (IND) of India. REUTERS/Mike Blake

2016 Rio Olympics - Badminton - Men's Singles - Quarterfinals - Riocentro - Pavilion 4 - Rio de Janeiro, Brazil - 17/08/2016. Srikanth Kidambi (IND) of India plays against Lin Dan (CHN) of China. REUTERS/Mike Blake

European Olympic Committees (EOC) President Patrick Hickey (L), International Olympic Committee President (IOC) Thomas Bach (C) and President of the German Olympic Sports Confederation (DOSB) Alfons Hoermann arrive for a ceremony marking the 10th anniversary of the confederation in Frankfurt, Germany, May 20, 2016. REUTERS/Kai Pfaffenbach

2016 Rio Olympics - Cycling Track - Final - Men's Keirin Final Race for 1st-6th Places - Rio Olympic Velodrome - Rio de Janeiro, Brazil - 16/08/2016. Jason Kenny (GBR) of Britain celebrates winning the gold medal. REUTERS/Paul Hanna

2016 Rio Olympics - Athletics - Final - Men's 110m Hurdles Final - Olympic Stadium - Rio de Janeiro, Brazil - 16/08/2016. Omar McLeod (JAM) of Jamaica celebrates after winning the race REUTERS/Dylan Martinez

A box of guns, which belonged to a man who was arrested, is pictured during a news conference at the customs investigation office in Frankfurt, Germany, August 17, 2016. REUTERS/Ralph Orlowski