Wang Xiyu of China returns the ball during the second round of women's singles qualifying match against Rebecca Peterson of Sweden at the 2019 Rogers Cup in Toronto, Canada, Aug. 4, 2019. (Xinhua/Zou Zheng)

Wang Xiyu of China celebrates scoring during the second round of women's singles qualifying match against Rebecca Peterson of Sweden at the 2019 Rogers Cup in Toronto, Canada, Aug. 4, 2019. (Xinhua/Zou Zheng)

Zhang Shuai of China returns the ball during the second round of women's singles qualifying match against Anastasia Potapova of Russia at the 2019 Rogers Cup in Toronto, Canada, Aug. 4, 2019. (Xinhua/Zou Zheng)

Rebecca Peterson of Sweden returns the ball the second round of women's singles qualifying match against Wang Xiyu of China at the 2019 Rogers Cup in Toronto, Canada, Aug. 4, 2019. (Xinhua/Zou Zheng)

Zhang Shuai of China returns the ball during the second round of women's singles qualifying match against Anastasia Potapova of Russia at the 2019 Rogers Cup in Toronto, Canada, Aug. 4, 2019. (Xinhua/Zou Zheng)

Wang Xiyu of China returns the ball during the second round of women's singles qualifying match against Rebecca Peterson of Sweden at the 2019 Rogers Cup in Toronto, Canada, Aug. 4, 2019. (Xinhua/Zou Zheng)

Zhang Shuai of China gets medical treatment during the second round of women's singles qualifying match against Anastasia Potapova of Russia at the 2019 Rogers Cup in Toronto, Canada, Aug. 4, 2019. (Xinhua/Zou Zheng)

Anastasia Potapova of Russia celebrates scoring during the second round of women's singles qualifying match against Zhang Shuai of China at the 2019 Rogers Cup in Toronto, Canada, Aug. 4, 2019. (Xinhua/Zou Zheng)

Zhang Shuai of China returns the ball during the second round of women's singles qualifying match against Anastasia Potapova of Russia of the United States at the 2019 Rogers Cup in Toronto, Canada, Aug. 4, 2019. (Xinhua/Zou Zheng)

Wang Xiyu of China returns the ball during the second round of women's singles qualifying match against Rebecca Peterson of Sweden at the 2019 Rogers Cup in Toronto, Canada, Aug. 4, 2019. (Xinhua/Zou Zheng)

Anastasia Potapova of Russia returns the ball during the second round of women's singles qualifying match against Zhang Shuai of China at the 2019 Rogers Cup in Toronto, Canada, Aug. 4, 2019. (Xinhua/Zou Zheng)

Anastasia Potapova of Russia returns the ball during the second round of women's singles qualifying match against Zhang Shuai of China at the 2019 Rogers Cup in Toronto, Canada, Aug. 4, 2019. (Xinhua/Zou Zheng)