Caroline Garcia's Tianjin Open title defence came to a grinding halt against Wang Yafan on Wednesday.
The Frenchwoman suffered a 6-4 6-2 loss to exit at the last-16 stage, leaving Chinese player Wang to face Sweden's Rebecca Peterson in the quarter-finals.
Peterson was leading 7-5 3-2 against Wang Xinyu when her Chinese opponent retired hurt.
Kazakhstan's Yulia Putintseva, the sixth seed, sealed a dominant 6-1 6-2 triumph over 2011 US Open champion Samantha Stosur.
Up next for the world number 36 is a meeting with Ons Jabeur, who downed Wang Xiyu 6-4 6-2.