Sania Mirza [ Images ] bowed out of the women's singles at the Cincinnati Open after losing to top seed Patty Schnyder [ Images ] of Switzerland [ Images ] on Friday night.

The ninth seeded Indian ace was beaten 6-7(7), 5-7 in the quarter-finals.

In other quarter-final action, fourth seed Katarina Srebotnik of Slovenia beat sixth seed Marion Bartoli [ Images ] of France [ Images ] 6-2, 6-1 while Vera Zvonareva [ Images ] of Russia [ Images ] proved too good for fifth seed Jelena Jankovic [ Images ] of Serbia and Montenegro, winning 6-1, 6-1.

In the last quarter-final, Serena Williams [ Images ] beat Amy Fraizer 6-2, 6-2.

Sania and her Polish partner Marta Domachowska are in the semifinals of the doubles event, having scored a hard fought 6-4, 5-7, 7-6 victory over the Chinese-Uzbek pair of Meng Yuan and Varvara Lepchenko.