She will next face 19-year-old Marketa Vondrousova of the Czech Republic. Vondrousova continued to refresh her personal best at Grand Slams with a 7-6 (1), 7-5 victory over Petra Martic.

Duan Yingying and Zheng Saisai got past their fellow Chinese Xu Yifan and Canada's Gabriela Dabrowski 6-2, 5-7, 7-5 to reach women's doubles semifinals.

But another Chinese player Zhang Shuai underwent a gloomy day, as she lost the women's doubles quarterfinals with Samantha Stosur of Australia to Kristina Mladenovic and Timea Babos 3-6, 6-1, 7-6 (3) in a rematch of the Australian Open final this year.

Then Zhang and another Australian partner John Peers conceded a 1-6, 7-5, 10-8 defeat to Gabriela Dabrowski and Mate Pavic in mixed doubles quarterfinals.

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