"I was a little bit in shock," Carreno Busta said. "The rules are the rules. The referee and the supervisor did the right thing, but it's not easy to do it."
Shanghai-based Oriental Sports Daily doubted the Brazilian player had time to go through any kind of medical quarantine.
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.
Ricciardo finished sixth ahead of Hamilton, whose late-race charge also saw him take the bonus point for fastest lap.
Ruichang now continue at second in the standings behind Qingdao Renzhou, which also enjoyed a victory on Saturday, defeating Jiangsu Weikeduo 4-1 with ease.
He became a first-team regular under manager Renato Gaucho following the departure of Everton Soares to Benfica last month.
It is the second such injury in eight months for Zaniolo, as the 21-year-old was stretchered off in the Serie A game between Roma and Juventus in January, following a tackle with Adrien Rabiot and Matthijs de Ligt.
"It's going to be one of the young guys, I think, if you count Dominic Thiem as a young guy, as well. He obviously has a chance to win. Now I think it is the time where it gets really interesting. We'll see where we go from here." Enditem
In the other two matches of the day, Hunan Hualai edged Shenzhen Nankeda 3-2, while Olympic champion Chen Long led Xiamen Tefang to a win over Anhui Souyu 5-0. Enditem
Inter Milan midfielder Barella headed home in first-half stoppage time after receiving a long pass from Ciro Immobile, with the goal enough for Italy to clinch three points in Amsterdam.
Belarus's Victoria Azarenka advanced into the quarterfinals after rallying past Karolina Muchova of the Czech Republic 5-7, 6-1, 6-4.