U.S. Olympic swimmers Jack Conger and Gunnar Bentz arrive at the Miami international airport from Rio de Janeiro a day after Brazilian police detained their passports and questioned them, in Miami August 19, 2016. REUTERS/Cassandra Garrison

2016 Rio Olympics - Badminton - Women's Singles - Gold Medal Match - Riocentro - Pavilion 4 - Rio de Janeiro, Brazil - 19/08/2016. P.V. Sindhu (IND) of India lies on the court during her match against Carolina Marin (ESP) of Spain. REUTERS/Marcelo del Pozo

2016 Rio Olympics - Badminton - Women's Singles - Gold Medal Match - Riocentro - Pavilion 4 - Rio de Janeiro, Brazil - 19/08/2016. P.V. Sindhu (IND) of India plays against Carolina Marin (ESP) of Spain. REUTERS/Marcelo del Pozo

2016 Rio Olympics - Badminton - Women's Singles - Gold Medal Match - Riocentro - Pavilion 4 - Rio de Janeiro, Brazil - 19/08/2016. Carolina Marin (ESP) of Spain talks with P.V. Sindhu (IND) of India after winning their match. REUTERS/Marcelo del Pozo

2016 Rio Olympics - Badminton - Women's Singles - Gold Medal Match - Riocentro - Pavilion 4 - Rio de Janeiro, Brazil - 19/08/2016. Carolina Marin (ESP) of Spain celebrates at her match against P.V. Sindhu (IND) of India. REUTERS/Alkis Konstantinidis

2016 Rio Olympics - Badminton - Women's Singles - Gold Medal Match - Riocentro - Pavilion 4 - Rio de Janeiro, Brazil - 19/08/2016. Carolina Marin (ESP) of Spain celebrates winning her match against P.V. Sindhu (IND) of India. REUTERS/Marcelo del Pozo

2016 Rio Olympics - Badminton - Women's Singles - Gold Medal Match - Riocentro - Pavilion 4 - Rio de Janeiro, Brazil - 19/08/2016. Carolina Marin (ESP) of Spain celebrates winning her match against P.V. Sindhu (IND) of India. REUTERS/Alkis Konstantinidis

2016 Rio Olympics - Badminton - Women's Singles - Gold Medal Match - Riocentro - Pavilion 4 - Rio de Janeiro, Brazil - 19/08/2016. Carolina Marin (ESP) of Spain celebrates with her coach Fernando Rivas after winning her match against P.V. Sindhu (IND) of India. REUTERS/Marcelo del Pozo