Second seed Rebecca Peterson was dumped out of the L'Open 35 de Saint-Malo after suffering a 6-4 6-0 quarter-final defeat to Varvara Gracheva.
Russian Gracheva will face Italy's Jasmine Paolini in the last four after she overcame Anna Karolina Schmiedlova 6-3 7-5.
Peterson's defeat means Viktorija Golubic is the highest-ranked player remaining, the Swiss fifth seed cruising past Aliaksandra Sasnovich 6-1 6-0.
She will face Harmony Tan in the semi-finals after the French player saw off Aliona Bolsova 7-6 (7-3) 6-0.
