Mertens stuns Swiatek in Beijing, sets up China Open semi-final with Zheng

VIDEO SHOWS: HIGHLIGHTS FROM WTA1000 CHINA OPEN QUARTER FINALS, AS CHINA'S ZHENG QUINWEN DEFEATS UKRAINE'S ELINA SVITOLINA 6-3 7-6(6) AND BELGIUM'S ELISE MERTENS DEFEATS POLAND'S IGA SWIATEK 7-6(0) 6-

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