Sara Errani overcame a slow start to defeat Chanelle Scheepers of South Africa 2-6, 6-1, 6-3 in the quarter-finals of the Gastein Ladies on Friday.
The 14th-ranked Italian, who won the doubles at Wimbledon last week, was broken three times in the opening set as she won just six points on her serve.
Errani, who was seeded second, dominated play afterward to set up a semi-final against Shelby Rogers, who beat No. 7 Camila Giorgi of Italy 6-1, 7-5.
Appearing in her first WTA quarter-final, the 147th-ranked qualifier from the US dropped serve only once, while Giorgi hit 11 double faults.
Earlier, Andrea Petkovic reached her third semi-final of the season by defeating Stefanie Voegele of Switzerland 6-3, 6-2.
The fourth-seeded German, who won her first of three career titles here in 2009, broke Voegele’s serve eight times in a match interrupted for 3.5 hours by rain at 1-1 in the second set.
Petkovic will next play Grace Min of the US, who beat No. 8 Karolina Pliskova of the Czech Republic 6-2, 6-1 in just under an hour.
It is the first WTA semifinal for the 138th-ranked Min, who won two events on the lower-tier ITF circuit this season.
AP, BUCHAREST, Romania
Top-seeded Simona Halep defeated Spain’s Lara Arruabarrena 6-3, 6-1 on Friday to advance to the semi-finals of the BRD Bucharest Open.
Halep will play fellow Romanian Monica Niculescu on Saturday. The unseeded Niculescu upset eighth-seeded Polona Hercog of Slovenia in a 6-2, 2-6, 7-6 (7/3) victory.
The other semifinal will be between second-seeded Roberta Vinci of Italy and Slovakia’s Kristina Kucova.
Vinci beat Petra Cetkovska of the Czech Republic 7-5, 6-3, while Kucova defeated Montenegro’s Danka Kovinic 6-4, 1-6, 6-3.