Clijsters will next face Russian 23rd seed Alisa Kleybanova, who beat Bulgaria's Tsvetana Pironkova 6-7 (5-7) 6-3 6-1.

CNN: STORY HIGHLIGHTS

The remarkable run of results continued when sixth seed Vera Zvonareva was beaten 3-6 6-4 6-2 by fellow-Russian Alisa Kleybanova.

CNN: Dementieva joins seeded casualties in Tokyo

Elsewhere, sixth seed Anna Chakvetadze set up an enticing third round meeting with fellow Russian Maria Kirilenko by beating Alisa Kleybanova 6-3 6-4.

BBC: Venus stumbles into third round

Thursday's quarterfinals see Serbian sixth seed Jelena Jankovic taking on Russia's Alisa Kleybanova and Australian eighth seed Samantha Stosur playing Spain's Maria Jose Martinez Sanchez.

CNN: Radwanska to face friend Wozniacki in Indian Wells semis

Williams, 26, will play in the quarter-finals on Friday against the winner of Thursday's second-round match between Russia's Alisa Kleybanova and Swiss fifth seed Patty Schnyder.

BBC: Serena given workout in Stanford

Seeds Agnieszka Radwanska, Flavia Pennetta, Alisa Kleybanova, Agnes Szavay, Sybille Bammer and Aleksandra Wozniak also advanced, but Alize Cornet, Dominika Cibulkova, Zheng Jie, Ai Sugiyama and Sara Errani failed to progress.

BBC: Jelena Jankovic

But Jelena Jankovic, another ex top-ranked player, came from behind to level the tie by beating Alisa Kleybanova 4-6 6-4 6-0 as she won the last 11 games in a match lasting two hours and 18 minutes.

CNN: Injured Serena to miss Paris tournament

Monday proved an excellent day for the seeded women as Elena Dementieva (5), Sam Stosur (7), Agnieszka Radwanska (8), Li Na (11), Lucie Safarova (24), Alisa Kleybanova (28) and Kateryna Bondarenko (32) all went through without dropping a set.

BBC: Serena Williams and Caroline Wozniacki make progress

Twelfth seed Agnieszka Radwanska enjoyed a relatively comfortable passage into the third round with a 6-3 6-4 win over Croatia's Petra Martic, and the Pole will play Simona Halep after the Romanian beat Russia's 24th seed Alisa Kleybanova 6-4 7-6 (7-2).

BBC: Australian Open: Seventh seed Jelena Jankovic falls