Highlights of women's singles round of 16 match of 2019 WTA Shenzhen Open

Elise Mertens of Belgium serves during the women's singles round of 16 match against Wang Xiyu of China at WTA Shenzhen Open tennis tournament in Shenzhen, south China's Guangdong Province, Jan. 7, 2020. (Xinhua/Mao Siqian)