Highlights of quarter final matches at WTA Shenzhen Open

Katerina Siniakova of the Czech Republic serves during the quarter final match against her compatriot Karolina Pliskova at the WTA Shenzhen Open tennis tournament in Shenzhen, China, Jan. 4, 2018. Katerina Siniakova won 2-0. (Xinhua/Mao Siqian)