"It's not a random choice that we play with each other because we both feel like we can complement each other's game," Siegemund said. "Then something that turns out during the journey through the two weeks is that her game style is complementing me."
Volunteers simulated a series of operations including trauma rescue, emergency relief and transporting the wounded by helicopter during the drill.
Red Bull's Alex Albon also passed Ricciardo and looked briefly as if he might be able to challenge the two Mercedes, but his initial pace proved a false dawn as Hamilton duly took his sixth win of the season ahead of Bottas.
Siegemund/Zvonareva, who had never played together prior to this event, had total control over the match and defeated Melichar of the United States and Xu of China 6-4, 6-4 in 79 minutes.
The fifth seed rallied past long-time rival Borna Coric from Croatia 1-6, 7-6(6), 7-6(1), 6-3 to reach his first US Open semifinal.
The next mixed doubles game saw Zhang Wen/Wei Yaxin edge Zhou Haodong/Lin Xin to help Hunan take the lead. However, Zhejiang leveled again after Huang Yuxiang swept Wang Zhengxing in the men's singles.
Zhejiang then leveled again by a straight-set win in the women's singles, before Zheng Siwei/Huang Dongping took the decisive point for Qingdao after sweeping Dong Weijie/Lv Rouhao in just 15 minutes.
According to public information, smart gyms have already been on trial and have spread in many areas in China such as in Beijing, Chongqing, Zhejiang and Hunan, since 2015.
A concertina effect after the first start saw the slow-starting Red Bull of Max Verstappen - who had had engine trouble before the race had even started - and Pierre Gasly's AlphaTauri pushed off into the gravel at turn 2, resulting in the deployment of the safety car to clear the stricken vehicles.
Osaka broke in the fourth game of the third set to take a comfortable 3-1 lead. In the next game, Azarenka blew a golden opportunity to get back into the match, wasting all three break points as Osaka recovered from 0-40 down to hold for a 4-1 lead.
WASHINGTON, Sept. 13 (Xinhua) -- Second seed Dominic Thiem of Austria came back from two sets down to overcome German fifth seed Alexander Zverev 2-6, 4-6, 6-4, 6-3, 7-6(6) in the US Open men's singles final for his maiden Grand Slam title on Sunday.