Duan Ying-ying sprung another surprise in the WTA Suzhou Ladies Open as she beat Patricia Mayr-Achleitner to reach the semi-finals.
Duan accounted for fifth seed Ksenia Pervak in the first round of the WTA 125 hard-court event on home soil and also claimed a shock win over second seed Mayr-Achleitner to progress to the last four on Thursday.
Austrian world number 85 Mayr-Achleitner is ranked 78 places above Duan in the WTA rankings, but it was the 25-year-old underdog who prevailed 6-4 6-3 in an hour and 20 minutes.
Duan fired down seven aces and won five of the 10 break points she earned to set up a semi-final against Misa Eguchi.
Jana Cepelova showed no signs of fatigue after playing twice on Wednesday as the top seed beat Zheng Saisai 6-1 7-6 (9-7).
Cepelova came through her first and second round matches on the same day after rain had disrupted Tuesday's schedule, and the rising star from Slovakia ended Zheng's hopes of securing a tournament victory in her homeland.
World number 65 Cepelova wasted no time in winning the first set, but Zheng put up a fight in the second before the Slovak came out on top in a tie-break.
Fourth seed Anna-Lena Friedsam stands in the way of Cepelova and a place in the final after the German beat seventh seed Kateryna Kozlova 6-3 6-4.
Eguchi emerged victorious from an all-Japanese quarter-final against Risa Ozaki, winning 7-6 (7-5) 6-0.