Highlights of quarter final matches at WTA Shenzhen Open

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Karolina Pliskova of the Czech Republic hits a return 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)