Medvedev will next face fellow American Frances Tiafoe, and Thiem will take on Canada's rising star Felix Auger-Aliassime.
World number one Djokovic was stunningly disqualified after accidently hitting a line judge with a ball during his round of 16 clash with Pablo Carreno Busta of Spain.
The result left Corinthians ninth in the 20-team standings with nine points from seven matches, a point ahead of 13th-placed Botafogo.
In the 93rd minute, R&F's goalkeeper Han Jiaqi failed to clear out the ball from the box, giving Paulinho an opportunity to add a buzzer beater for Evergrande.
Coates said the Games will start as planned on July 23 "with or without COVID-19," stressing the Olympics has never been cancelled outside of world wars.
Kenin, who won her first Grand Slam title at this year's Australian Open, did not face a break point in her match against 17-year-old Fernandez before nailing her convincing win.
The second-tier league will take place behind closed doors. In the first session, the 18 teams will be divided into three groups, which will follow the traditional home-away round robin format.
"Gu is a living example of the sportsmanship of 'if others can do it, I can do it'. It is very impressive," said Yin. Enditem
Botafogo looked set for a memorable victory when former Chelsea forward Salomon Kalou struck his first goal for the club in the 75th minute.
Cheptegei and Kiplimo are only part of the top tier of athletes that the East African country has to offer.
The home team had a great chance to even things up in the 30th minute when Eli Dasa's ball found an unmarked Eran Zahavi whose shot went wide of goal.