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

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