Ivanovic ousted by Russian; Jankovic, Dementieva continue run

As the second round of the Toray Pan Pacific Open was over, eight woman will now battle it out on Friday for a semifinal berth. The biggest upset so far featured Nadia Petrova ousting Ana Ivanovic in three sets.

It was Petrova's first win in their four meetings against the Serb, as she won 61 16 62. It is Petrova's first time in the quarters of Tokyo, after she fell in the first round on her first two attempts in 2000 and 2003.

Ivanovic's countrywoman, Jelena Jankovic, had the opposite result of Ivanovic, winning to Flavia Pennetta, 62 61. Jankovic needs to win the tournament to reclaim her No. 1 spot.

The other three seeds in action all won handily, with No.3 seed Elena Dementieva beating Alizé Cornet, 60 63; No.5 seed Svetlana Kuznetsova beating wildcard Ayumi Morita, 61 61; and No.6 seed Agnieszka Radwanska beating Marion Bartoli, 62 63. Dementieva's win secured her qualification for the season-ending Sony Ericsson Championships - Doha 2008 (click here to read more).

All quarterfinals take place Friday, with Jankovic facing Kuznetsova, Dementieva playing Srebotnik, Safina playing Kanepi and Radwanska taking on Petrova.