Moscow, Russia (My Sportsbook) - Former world No. 1 and reigning Moscow champion Jelena Jankovic of Serbia landed in the quarterfinals, while top- seeded and 2008 runner-up Vera Zvonareva was a second-round upset victim Thursday at the $1 million Kremlin Cup.

The second-seeded Jankovic advanced with a 7-6 (7-5), 6-3 victory over Czech Lucie Safarova, while Zvonareva was surprisingly whipped by Bulgarian qualifier Tsvetana Pironkova 6-0, 6-2 at Olympic Stadium. Jankovic defeated Zvonareva in last year's finale here.

Another seeded victor on Day 4 was No. 8 Francesca Schiavone, as the Italian veteran handled Romanian Monica Niculescu 6-2, 7-5.

In other second-round action, Russian Vera Dushevina overcame Hungarian Agnes Szavay 3-6, 6-4, 6-3, Russian Alisa Kleybanova drilled qualifier and compatriot Evgeniya Rodina 6-1, 6-2 and Russian glamour girl Maria Kirilenko dumped Canadian Aleksandra Wozniak 6-4, 6-3.

Friday's quarterfinals will pit Jankovic against Kleybanova, Schiavone versus Kirilenko, Belarus' Olga Govortsova against Dushevina and Pironkova versus Ukrainian Alona Bondarenko.

This week's winner will claim $157,427.