Petrova defeats Osterloh in straight sets at Istanbul

ISTANBUL, Turkey -- Third-seeded Nadia Petrova defeated American Lilia Osterloh 6-1, 6-2 Tuesday in the first round of the Istanbul Cup.

The 25th-ranked Russian will play Marta Domachowska of Poland in the second round of the clay-court tournament, a warm-up event for the French Open.

Sorana Cirstea downed Masa-Zec Peskiric of Slovenia 6-3, 6-4 . She will play second-seeded Agnieszka Radwanska.

Tsvetana Pironkova of Bulgaria defeated Polona Hercog of Slovenia 6-4, 7-5 and Liana Ungur of Romania stopped Cagla Buyukakcay of Turkey 6-2, 4-6, 7-6 (2).

Pironkova will next play Veronika Chvojkova of the Czech Republic, who defeated Pemra Ozgen of Turkey 7-5, 6-4, and Ungur will face top-seeded Elena Dementieva of Russia, who had bye.