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

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