2016 Rio Olympics - Swimming - Victory Ceremony - Men's 400m Individual Medley Victory Ceremony - Olympic Aquatics Stadium - Rio de Janeiro, Brazil - 06/08/2016. Chase Kalisz (USA) of USA celebrates with his silver medal on the podium. REUTERS/David Gray

2016 Rio Olympics - Swimming - Final - Men's 400m Individual Medley Final - Olympic Aquatics Stadium - Rio de Janeiro, Brazil - 06/08/2016. Daiya Seto (JPN) of Japan and Chase Kalisz (USA) of USA compete REUTERS/David Gray

2016 Rio Olympics - Olympic Village - Rio de Janeiro, Brazil - 06/08/2016. Sports fans queue to buy tickets to Olympic events. REUTERS/Marcos Brindicci

2016 Rio Olympics - Judo - Semifinal - Women -52 kg Semifinal Contests - Carioca Arena 2 - Rio de Janeiro, Brazil - 07/08/2016. Majlinda Kelmendi (KOS) of Kosovo reacts. REUTERS/Adrees Latif

2016 Rio Olympics - Judo - Semifinal - Women -52 kg Semifinal Contests - Carioca Arena 2 - Rio de Janeiro, Brazil - 07/08/2016. Majlinda Kelmendi (KOS) of Kosovo celebrates. REUTERS/Toru Hanai

2016 Rio Olympics - Swimming - Preliminary - Women's 400m Freestyle - Heats - Olympic Aquatics Stadium - Rio de Janeiro, Brazil - 07/08/2016. Katie Ledecky (USA) of USA competes on the way to setting a new Olympic record. REUTERS/Michael Dalder

2016 Rio Olympics - Swimming - Preliminary - Women's 400m Freestyle - Heats - Olympic Aquatics Stadium - Rio de Janeiro, Brazil - 07/08/2016. Katie Ledecky (USA) of USA competes on her way to setting a new Olympic record. REUTERS/Michael Dalder

2016 Rio Olympics - Cycling Road - Final - Women's Road Race - Fort Copacabana - Rio de Janeiro, Brazil - 07/08/2016. Anna van der Breggen (NED) of Netherlands celebrates at the end of the race. REUTERS/Paul Hanna