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Li Na, Petra Kvitova lead Stuttgart quarterfinalists

Photo: Dennis Grombkowski/Getty Images

Li Na was named one of Time's 100 most influential people last week.

Seeded players Li Na, Angelique Kerber and Petra Kvitova advanced to the quarterfinals of the Porsche Grand Prix on Thursday.

Second-seeded Li swept past qualifier Mirjana Lucic-Baroni 6-1, 6-2, and the third-seeded Kerber defeated Anastasia Pavlyuchenkova 6-0, 6-4.

Fifth-seeded Kvitova rallied past 2011 champion Julia Goerges 2-6, 7-6 (4), 6-2. Kvitova, the 2011 Wimbledon champion, is aiming for her second title of the year.

Ana Ivanovic beat eighth-seeded Nadia Petrova 6-4, 6-3. One day after upsetting Caroline Wozniacki, Carla Suarez Navarro lost 7-5, 6-4 to Yaroslava Shvedova.

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