SPORTS

Halep upset by qualifier Siegemund at Porsche Grand Prix

  • Petra Kvitova of the Czech Republic reacts during her match against Monica Niculescu of Romania at the WTA Tennis Grand Prix in Stuttgart, Germany, Thursday, April 21, 2016. (Daniel Maurer/dpa via AP)

    Petra Kvitova of the Czech Republic reacts during her match against Monica Niculescu of Romania at the WTA Tennis Grand Prix in Stuttgart, Germany, Thursday, April 21, 2016. (Daniel Maurer/dpa via AP)  (The Associated Press)

  • Petra Kvitova of the Czech Republic returns a ball to Monica Niculescu of Romania during the WTA Tennis Grand Prix in Stuttgart, Germany, Thursday, April 21, 2016. (Daniel Maurer/dpa via AP)

    Petra Kvitova of the Czech Republic returns a ball to Monica Niculescu of Romania during the WTA Tennis Grand Prix in Stuttgart, Germany, Thursday, April 21, 2016. (Daniel Maurer/dpa via AP)  (The Associated Press)

  • Petra Kvitova of the Czech Republic reacts during her match against Monica Niculescu of Romania at the WTA Tennis Grand Prix in Stuttgart, Germany, Thursday, April 21, 2016. (Daniel Maurer/dpa via AP)

    Petra Kvitova of the Czech Republic reacts during her match against Monica Niculescu of Romania at the WTA Tennis Grand Prix in Stuttgart, Germany, Thursday, April 21, 2016. (Daniel Maurer/dpa via AP)  (The Associated Press)

German qualifier Laura Siegemund upset fourth-seeded Simona Halep 6-1, 6-2 to reach the quarterfinals of the Porsche Grand Prix on Thursday.

Siegemund is set to improve on her career-high No. 71 ranking at the indoor clay-court tournament. She equaled her previous best result of making the quarterfinals at the clay event in Charleston this month.

Halep finished 2015 as No. 2 in the world but the Romanian has dropped to No. 6 and will fall further after the latest loss.

Also, fifth-seeded Petra Kvitova of the Czech Republic rallied to beat Monica Niculescu of Romania 2-6, 7-6 (5), 6-2, and No. 7 Carla Suarez Navarro defeated wild card Anna-Lena Friedsam of Germany 6-2, 6-2.