Laura Siegemund from Germany returns a ball to Agnieszka Radwanska from Poland during their semifinals at the WTAÂ tournament in Stuttgart, Germany, Saturday, April 23, 2016. (Marijan Murat/dpa via AP)
The Associated Press
STUTTGART, Germany (AP) - Qualifier Laura Siegemund upset top-seeded Agnieszka Radwanska 6-4, 6-2 on Saturday to set up an all-German Porsche Grand Prix final with defending champion Angelique Kerber.
The 71st-ranked Siegemund caused her biggest upset yet at the indoor clay-court tournament by defeating the second-ranked Radwanska in 1 hour, 23 minutes. She had already seen off the fourth-seeded Simona Halep and sixth-seeded Roberta Vinci to reach her first semifinal.
Siegemund converted five of her 13 break opportunities to make Sunday's final in her hometown.
Kerber earlier defeated Petra Kvitova of the Czech Republic 6-4, 4-6, 6-2 to reach her second successive final.
Second-seeded Kerber saved 10 of the 13 break points she faced and converted five of her 10 opportunities to beat the fifth-seeded Czech on her first match point.
Angelique Kerber from Germany returns a ball during her semifinal match against Petra Kvitova from Czech Republic at the WTA tennis tournament in Stuttgart, southern Germany, Saturday, April 23, 2016. (Marijan Murat/dpa via AP)
The Associated Press
Angelique Kerber from Germany holds her rackted during her semifinal match against Petra Kvitova from Czech Republic at the WTA tennis tournament in Stuttgart, southern Germany, Saturday, April 23, 2016. (Marijan Murat/dpa via AP)
The Associated Press
Angelique Kerber from Germany celebrates after winning the semifinal match against Petra Kvitova from Czech Republic at the WTA tournament in Stuttgart, Germany, Saturday, April 23, 2016. (Marijan Murat/dpa via AP)
The Associated Press
Angelique Kerber from Germany celebrates after winning the semifinal match against Petra Kvitova from Czech Republic at the WTA tournament in Stuttgart, Germany, Saturday, April 23, 2016. (Marijan Murat/dpa via AP)
The Associated Press
Czech Republic's Petra Kvitova returns a ball to Angelique Kerber from Germany during their semifinal match at the WTA tennis tournament in Stuttgart, southern Germany, Saturday, April 23, 2016. (Marijan Murat/dpa via AP)
The Associated Press
Angelique Kerber from Germany celebrates after winning the semifinal match against Petra Kvitova from Czech Republic at the WTA tournament in Stuttgart, Germany, Saturday, April 23, 2016. (Marijan Murat/dpa via AP)
The Associated Press
Agnieszka Radwanska from Poland returns a ball to Laura Siegemund from Germany during their semifinals at the WTAÂ tournament in Stuttgart, Germany, Saturday, April 23, 2016. (Marijan Murat/dpa via AP)
The Associated Press