Eugenie Bouchard advanced to the semifinals of the Luxembourg Open after opponent Andrea Petkovic retired midway through the second set of their quarterfinal tie on Thursday.
Bouchard was 4-0 up in the second when Petkovic stopped because of a left thigh injury, but was trailing overall after the German secured the first 6-4.
The Canadian will play No. 1 seed Julia Goerges in the final four on Friday, in what will be only her second semifinal of the season. Goerges defeated Donna Vekic 6-3, 3-6, 6-3 to advance from her quarterfinal.
Elsewhere, Dayana Yastremska, the champion in Hong Kong last weekend, defeated Margarita Gasparyan 6-1, 6-4. The 18-year-old will play Belinda Bencic in Friday's other semifinal after she advanced past Vera Lapko 6-4, 6-1.