Home finalist guaranteed
Home favourites Li Na and Peng Shuai will meet in the semi-finals of the Shenzhen Longgang Gemdale Open - but second seed Marion Bartoli crashed out.
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The French player, who had cruised past Chan Wing-Yau and Stefanie Voegele, failed to produce her best form and was well beaten 6-3 6-2 by fifth seed Klara Zakopalova.
Li was just as clinical as the Czech in beating Serbia's Bojana Jovanovski 6-3 6-3, while Peng came from a set down to see off Germany's Annika Beck 2-6 7-5 6-2 in a match featuring 13 breaks of serve.
In the day's last match, Romania's Monica Niculescu ended the hopes of another Chinese player, Zhou Yi-Miao, winning 6-4 6-2 to set up a clash with Zakopalova.