Simona Halep of Romania and Caroline Wozniacki of Denmark will meet in the semifinals of the Porsche Grand Prix after winning their respective quarterfinals on Friday.
The second-seeded Halep needed 81 minutes to defeat Sara Errani of Italy 6-4, 6-4, while the fourth-seeded Wozniacki had little trouble in defeating Carla Suarez Navarro of Spain 6-0, 6-3.
Irrespective of the result in Saturday's semifinal, Halep will move up to No. 2 when the world rankings are updated Monday following Maria Sharapova's loss to Angelique Kerber of Germany on Thursday.
Kerber upset another Russian, the sixth-seeded Ekaterina Makarova, 6-3, 6-2 to book her place in the other semifinal, where she will face Madison Brengle of the United States.
The American, who upset third-seeded Petra Kvitova on Thursday, rallied to beat Caroline Garcia of France 3-6, 6-3, 6-3 in the last quarterfinal.
