
Naomi Osaka of Japan serves during the women's singles first round match against Angelique Kerber of Germany at the 2017 US Open tennis tournament in New York, the United States, Aug. 29, 2017. (Xinhua/Wang Ying)

Naomi Osaka of Japan serves during the women's singles first round match against Angelique Kerber of Germany at the 2017 US Open tennis tournament in New York, the United States, Aug. 29, 2017. (Xinhua/Wang Ying)