2016 Rio Olympics - Swimming - Preliminary - Men's 200m Butterfly - Heats - Olympic Aquatics Stadium - Rio de Janeiro, Brazil - 08/08/2016. Michael Phelps (USA) of USA is seen with red cupping marks on his shoulder as he competes. REUTERS/Michael Dalder

2016 Rio Olympics - Swimming - Preliminary - Men's 200m Butterfly - Heats - Olympic Aquatics Stadium - Rio de Janeiro, Brazil - 08/08/2016. Michael Phelps (USA) of USA is seen with red cupping marks on his shoulder as he competes. REUTERS/Michael Dalder

International Olympic Committee President Thomas Bach during an interview with Reuters at the Olympic Park. REUTERS/Kevin Coombs

International Olympic Committee President Thomas Bach during an interview with Reuters at the Olympic Park. REUTERS/Kevin Coombs

2016 Rio Olympics - Swimming - Preliminary - Women's 200m Freestyle - Heats - Olympic Aquatics Stadium - Rio de Janeiro, Brazil - 08/08/2016. Katie Ledecky (USA) of USA reacts. REUTERS/Michael Dalder

Former NBA player Amar'e Stoudemire (C) signs autographs during a workshop for youth entitled "Amar'e Stoudemire 2016 Basketball Peace Camp", days after arriving in Israel to play for Hapoel Jerusalem Basketball Club, in Jerusalem August 8, 2016. REUTERS/Ronen Zvulun

Former NBA player Amar'e Stoudemire speaks to children during a workshop for youth entitled "Amar'e Stoudemire 2016 Basketball Peace Camp", days after arriving in Israel to play for Hapoel Jerusalem Basketball Club, in Jerusalem August 8, 2016. REUTERS/Ronen Zvulun

Former NBA player Amar'e Stoudemire (C) watches children play basketball during a workshop for youth entitled "Amar'e Stoudemire 2016 Basketball Peace Camp", days after arriving in Israel to play for Hapoel Jerusalem Basketball Club, in Jerusalem August 8, 2016. REUTERS/Ronen Zvulun