Highlights of first round at Rogers Cup

Su-Wei Hsieh(L) of Chinese Taipei returns the ball during the first round of women's singles match against Sofia Kenin of the United States at the 2019 Rogers Cup in Toronto, Canada, Aug. 5, 2019. (Xinhua/Zou Zheng)

Caroline Wozniacki of Denmark returns the ball during the first round of women's singles match against Yulia Putintseva of Kazakhstan at the 2019 Rogers Cup in Toronto, Canada, Aug. 5, 2019. (Xinhua/Zou Zheng)

Su-Wei Hsieh of Chinese Taipei reacts during the first round of women's singles match against Sofia Kenin of the United States at the 2019 Rogers Cup in Toronto, Canada, Aug. 5, 2019. (Xinhua/Zou Zheng)

Sofia Kenin of the United States returns the ball during the first round of women's singles match against Su-Wei Hsieh of Chinese Taipei at the 2019 Rogers Cup in Toronto, Canada, Aug. 5, 2019. (Xinhua/Zou Zheng)

Stan Wawrinka of Switzerland returns the ball during the first round of men's singles match against Grigor Dimitrov of Bulgaria at the 2019 Rogers Cup in Montreal, Canada, Aug. 5, 2019. (Xinhua/Andrew Soong)

Grigor Dimitrov of Bulgaria returns the ball during the first round of men's singles match against Stan Wawrinka of Switzerland at the 2019 Rogers Cup in Montreal, Canada, Aug. 5, 2019. (Xinhua/Andrew Soong)

Belinda Bencic of Switerland celebrates victory after the first round of women's singles match against Anastasia Potapova of Russia at the 2019 Rogers Cup in Toronto, Canada, Aug. 5, 2019. (Xinhua/Zou Zheng)

Anastasia Potapova of Russia reacts during the first round of women's singles match against Belinda Bencic of Switerland at the 2019 Rogers Cup in Toronto, Canada, Aug. 5, 2019. (Xinhua/Zou Zheng)

Belinda Bencic of Switerland returns the ball during the first round of women's singles match against Anastasia Potapova of Russia at the 2019 Rogers Cup in Toronto, Canada, Aug. 5, 2019. (Xinhua/Zou Zheng)