Ana Ivanovic of Serbia beat eight-seeded Russian Nadia Petrova 6-4,6-3 to enter her first quarter final on clay since 2010 Rome. Ivanovic also extends her head to head series to 9-5 against the world number 11 Russian. Seeded players Li Na, Angelique Kerber and Petra Kvitova also advanced to the quarterfinals. The 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. The fifth-seeded Kvitova rallied past 2011 champion Julia Goerges, 2-6,7-6,6-2. Kvitova, the 2011 Wimbledon champion, is looking for her second title of the year after winning Dubai earlier this year.