Naomi Osaka of Japan reacts during the third round of women's singles match against Iga Swiatek of Poland at the 2019 Rogers Cup in Toronto, Canada, Aug. 8, 2019. Naomi Osaka of Japan won 2-0. (Xinhua/Zou Zheng)

Naomi Osaka of Japan returns the ball against Iga Swiatek of Poland during the third round of women's singles match at the 2019 Rogers Cup in Toronto, Canada, Aug. 8, 2019. Naomi Osaka of Japan won 2-0. (Xinhua/Zou Zheng)

Naomi Osaka (L) of Japan shakes hands with Iga Swiatek of Poland after their third round of women's singles match at the 2019 Rogers Cup in Toronto, Canada, Aug. 8, 2019. Naomi Osaka of Japan won 2-0. (Xinhua/Zou Zheng)

Naomi Osaka of Japan celebrates vicotry after the third round of women's singles match against Iga Swiatek of Poland at the 2019 Rogers Cup in Toronto, Canada, Aug. 8, 2019. Naomi Osaka of Japan won 2-0. (Xinhua/Zou Zheng)

Naomi Osaka of Japan returns the ball against Iga Swiatek of Poland during the third round of women's singles match at the 2019 Rogers Cup in Toronto, Canada, Aug. 8, 2019. Naomi Osaka of Japan won 2-0. (Xinhua/Zou Zheng)

Iga Swiatek of Poland returns the ball against Naomi Osaka of Japan during the third round of women's singles match at the 2019 Rogers Cup in Toronto, Canada, Aug. 8, 2019. Naomi Osaka of Japan won 2-0. (Xinhua/Zou Zheng)