Wang Qiang of China hits a return during the women's singles third round match against Elina Svitolina of Ukraine at the 2018 US Open in New York, the United States, Aug. 31, 2018. Elina Svitolina won 2-0. (Photos: Xinhua)

Wang Qiang of China reacts during the women's singles third round match against Elina Svitolina of Ukraine at the 2018 US Open in New York, the United States, Aug. 31, 2018. Elina Svitolina won 2-0.

Elina Svitolina of Ukraine hits a return during the women's singles third round match against Wang Qiang of China at the 2018 US Open in New York, the United States, Aug. 31, 2018. Elina Svitolina won 2-0.

Victoria Azarenka of Belarus reacts during the women's singles third round match against Sloane Stephens of the United States at the 2018 US Open in New York, the United States, Aug. 31, 2018. Stephens won 2-0.

Victoria Azarenka of Belarus hits a return during the women's singles third round match against Sloane Stephens of the United States at the 2018 US Open in New York, the United States, Aug. 31, 2018. Stephens won 2-0.

Victoria Azarenka of Belarus hits a return during the women's singles third round match against Sloane Stephens of the United States at the 2018 US Open in New York, the United States, Aug. 31, 2018. Stephens won 2-0.

Victoria Azarenka of Belarus hits a return during the women's singles third round match against Sloane Stephens of the United States at the 2018 US Open in New York, the United States, Aug. 31, 2018. Stephens won 2-0.

Sloane Stephens of the United States hits a return during the women's singles third round match against Victoria Azarenka of Belarus at the 2018 US Open in New York, the United States, Aug. 31, 2018. Stephens won 2-0.

Sloane Stephens of the United States hits a return during the women's singles third round match against Victoria Azarenka of Belarus at the 2018 US Open in New York, the United States, Aug. 31, 2018. Stephens won 2-0.

Sloane Stephens of the United States hits a return during the women's singles third round match against Victoria Azarenka of Belarus at the 2018 US Open in New York, the United States, Aug. 31, 2018. Stephens won 2-0.