Liang Weikeng/Zheng Xuhui moved past Dong Weijie/Ni Bowen in the mixed doubles to overtake the lead for Shenzhen, while Han Qianxi overwhelmed Zhang Yiman in the women's singles to level for Zhejiang.
Banka said his focus is "absolutely" on the welfare of athletes, and that the anti-doping system that "has served clean athletes" must be protected.
Despite the easy win, the Russian star said his opponent has a bright future.
Third seed Williams essayed a signature comeback and served 12 aces to edge past her American compatriot Stephens 2-6, 6-2, 6-2 in one hour and 43 minutes.
On Friday, Piatek played 63 minutes against the Netherlands in Amsterdam. Poland lost 1-0 after Steven Bergwijn's goal. Enditem
Kim said that his team had no injuries and had good preparation work during the over eight months' of training sessions.
The pandemic forced clubs to develop creative concepts to stay in close contact with fans and partners worldwide. "Virtual tours run by several clubs have been a great success," he added.
In the women's singles, fourth seed Osaka survived a ding-dong battle against Kostyuk to emerge victorious 6-3, 6-7 (4), 6-2 after two hours and 33 minutes.
"The many games are a threat to the players' health. I don't understand why we went back to only three substitutes in the Nations League instead of five," Loew complained about UEFA's bad planning.
Once again Atletico preferred to play their defensive game and only looked to attack their rivals when they had fallen behind as they were outplayed for long periods.
In other matches on Sunday, Atletico Mineiro won 1-0 at Coritiba, Sport Recife beat Goias 2-1 at home, Gremio drew 1-1 at Atletico Goianiense, Vasco da Gama secured a 1-0 win at home to Athletico Paranaense and Palmeiras won 2-1 at Bragantino. Enditem