2016 Rio Olympics - Rowing - Preliminary - Men's Single Sculls Heats - Lagoa Stadium - Rio De Janeiro, Brazil - 06/08/2016. Fournier Rodriguez (CUB) of Cuba competes. REUTERS/Carlos Barria

2016 Rio Olympics - Rowing - Preliminary - Men's Single Sculls Heats - Lagoa Stadium - Rio De Janeiro, Brazil - 06/08/2016. Fournier Rodriguez (CUB) of Cuba competes. REUTERS/Carlos Barria

2016 Rio Olympics - Opening Ceremony - Maracana - Rio de Janeiro, Brazil - 05/08/2016. Soldiers stand guard as fireworks explode over the Maracana stadium. REUTERS/Nacho Doce

2016 Rio Olympics - Opening ceremony - Maracana - Rio de Janeiro, Brazil - 05/08/2016. The Olympic cauldron (top) is raised next to a sculpture during the opening ceremony. REUTERS/Morry Gash/Pool

United Nations Secretary General Ban Ki-moon, left, talks with International Olympic Committee President Thomas Bach, center, and Brazil interim President Michel Temer, right, in Maracana Stadium before the opening ceremony for the 2016 Summer Olympics in Rio de Janeiro, Brazil, Friday, Aug. 5, 2016. REUTERS/Mark Humphrey/Pool

2016 Rio Olympics - Opening ceremony - Maracana - Rio de Janeiro, Brazil - 05/08/2016. Annita performs during the opening ceremony. REUTERS/Stefan Wermuth

2016 Rio Olympics - Opening ceremony - Maracana - Rio de Janeiro, Brazil - 05/08/2016. Flagbearer Michael Phelps (USA) of United States of America leads his contingent during the opening ceremony. REUTERS/Stoyan Nenov

International Olympic Committee President Thomas Bach, center, stands as flags are presented during the opening ceremony for the 2016 Summer Olympics in Rio de Janeiro, Brazil, Friday, Aug. 5, 2016. REUTERS/Mark Humphrey/Pool)