Petrova, seeded third in the tournament, the final tuneup before the French Open begins Sunday, had no trouble in getting past Lilia Osterloh, 6-1, 6-2. She next goes against Marta Domachowska.

The two other seeded players on Tuesday's card also won in straight sets. No. 6-seeded Akgul Amanmuradova defeated Martina Muller, 6-4, 6-1; and eighth-seeded Tsvetana Pironkova knocked out Polona Hercog, 6-4, 7-5.

Other winners Tuesday were Sorana Cirstea, Veronika Chvojkova and Liana Ungur, who earned the right to square off Wednesday against defending Istanbul champion and top-seeded Elena Dementieva.