"I was playing well today," said Thiem. "I had a good plan for the match. He's very dangerous when he can dictate with his forehand. I was exactly trying to avoid that. He also has very, very fast legs. I was trying to play my fastest tennis to keep him on the backhand, to not let him dictate with the forehand."
Then in the third set, Williams was rarely troubled by her rival en route to the victory.
In other games in the top-tier League A, Portugal beat Croatia 4-1 thanks to goals by Joao Cancelo, Diogo Jota, Joao Felix and Andre Silva. Portugal were missing Cristiano Ronaldo, who was out because of a toe infection.
Ruichang took the first point with a straight win in the women's doubles, before Zhejiang fought back and took the victories in the men's singles and men's doubles. Then He Bingjiao overcame a one-set deficit to beat Han Qianxi in the women's singles, helping Ruichang to tie the game 2-2.
Liang Ruiji and Li Jingmin from Guangdong finished first and second respectively in the individual dressage race, and Penpa Tsering from Tibet came third.
He became a first-team regular under manager Renato Gaucho following the departure of Everton Soares to Benfica last month.
The women's long jump event saw teenager Qin Huiling better her PB by three times to land the victory at 6.37m. Zeng Rui also renewed her life-time best to win the women's triple jump title at 14.10m, while Fang Yaoqing won the men's triple jump at 16.88m. Enditem
In the women's doubles, Xu Yifan from China and America's Nicole Melichar reached the second round after edging past their opponents in straight sets. Enditem
Qingdao continue leading in the standings after nine games, with Ruichang ranking second by sweeping Shenzhen 5-0 on Sunday.
WASHINGTON, Sept. 3 (Xinhua) -- World number 77 Sorana Cirstea of Romania produced a sparkling performance to come from behind and beat No. 9 seed Johanna Konta of Britain 2-6, 7-6 (5), 6-4 in almost three hours to move into third round of the US Open on Thursday.
"I got a slipstream, found a gap and timed my sprint perfectly," he said. "But this is more of a surprise than the last win."