Stuttgart, Germany (SportsNetwork.com) - Former Wimbledon runner-up Agnieszka Radwanska came up an opening-round loser Wednesday at the Porsche Tennis Grand Prix.

Former French Open finalist Sara Errani dismissed the seventh-seeded Radwanska 7-6 (10-8), 6-4 on the indoor clay at Porsche Arena.

Meanwhile, rising Swiss teenager Belinda Bencic took out wild card and 2011 Porsche champion Julia Goerges of Germany 3-6, 6-3, 7-5.

Two other first-round matches saw Kazakhstan's Zarina Diyas double-bagel former Wimbledon runner-up Sabine Lisicki of Germany 6-0, 6-0 and German Angelique Kerber get past American Alexa Glatch 6-2, 7-5.

In some second-round action on Thursday, top-seeded former world No. 1 Maria Sharapova will take on Kerber, third-seeded Wimbledon champ Petra Kvitova will face American Madison Brengle and fourth-seeded former No. 1 and 2011 Porsche runner-up Caroline Wozniacki will be opposed by Czech Lucie Safarova.

The French Open titlist Sharapova is the reigning three-time Stuttgart champ, having beaten Ana Ivanovic in last year's marquee finale.

The 2015 Stuttgart winner will earn $108,000 and a new Porsche 911 Carrera sports car.