The defending champion will play eighth seed Marion Bartoli of France.
Champion Venus Williams was knocked out of the Family Circle Cup beaten 7-5, 6-4 by 17-year-old Tatiana Golovin of France.
The world number two suffered a surprise defeat by the Russian in the last 16 of the Italian Open.
Kim Clijsters beat Nadia Petrova 7-5, 6-7, 6-1 to set up a quarter-final clash with Venus Williams at the Antwerp Diamond Games.
Tatiana Golovin stunned top seed Nadia Petrova 6-1, 6-2 in the final of the Amelia Island championships.
The French teenager will meet top seed Nadia Petrova.
Top seed Nadia Petrova made short work of China's Zheng Jie with a 6-2, 6-3 victory to move into the quarter-finals of the Amelia Island championship on Thursday.
Top-seeded Nadia Petrova gave up just 13 points in the second set en route to a 6-4 6-0 triumph over Kaia Kanepi in the second round of the Amelia Island championship on Tuesday.
Amelie Mauresmo pummeled Martina Hingis 6-2, 6-2 in the semi-final of the Qatar Open.
Russian Nadia Petrova ended Lucie Safarova's brilliant run at the Paris Open when she outfoxed the Czech 4-6, 6-1, 6-4 in Sunday's final
Nadia Petrova and Dmitry Tursunov ensured a 2-0 victory over Spain in the final.
Dmitry Tursunov and Nadia Petrova combined to beat Mardy Fish and Ashley Harkleroad 6-3 7-5 to claim their first win of the mixed team competition after a shock loss to Australia in the tournament opener on Saturday.
Justine Henin-Hardenne secured a place in the semi-finals of the WTA Championships and remained on course to claim the year-end number one spot with a 6-4 6-4 win over Russia's Nadia Petrova on Thursday.
Top seed Maria Sharapova was stretched by Serbia's Ana Ivanovic before she claimed a 7-6 7-5 win to reach the semi-finals of the Linz Open on Friday.
The Russian overcame a groin injury to reach her first Kremlin Cup final beating Czech teenager Nicole Vaidisova.
Top seed Amelie Mauresmo joined Russian trio Elena Dementieva, Nadia Petrova and Anna Chakvetadze in the Kremlin Cup quarter-finals on Thursday.
Top seed Jelena Jankovic battled to an impressive 7-5, 6-4 win over Nadia Petrova to reach the semi-finals of the Los Angeles Classic on Friday. Jankovic, who is closing in on the world No.1 ranking, will face Dinara Safina in the last four after the Russian crushed Victoria Azarenka 6-3, 6-1.
The defending champion lost to Russia's Nadia Petrova 2-6, 3-6 in the quarterfinal.
Andy Roddick and Nadia Petrova made first round exits at the French Open on Tuesday
The Russian suffered a shock defeat in the first round of the French Open, beaten 6-2, 6-2 by Akiko Morigami of Japan.
Justine Henin-Hardenne battled her way to a 6-7, 6-4, 6-3 victory over Russia's Nadia Petrova to leave the countries level at 1-1 in Fed Cup
The second seeded Russian will play her doubles partner Anna-Lena Groenefeld, in the Family Circle Cup.
Top seed Nadia Petrova fired five aces in securing her 22nd victory of the year at the Amelia Island tournament.
Second seed Patty Schnyder was beaten by fifth-seeded Svetlana Kuznetsova of Russia in the quarter-finals.
Nadia Petrova pulled off a stunning 6-3, 7-5 victory over the world number two and top seed.
Sania Mirza lost to Tatiana Golovin 6-4, 6-2 in the second round at the Open Gaz de France
Maria Sharapova beat sixth seed Nadia Petrova 7-6, 6-4 in an all-Russian quarter-final at the Australian Open.
Maria Sharapova-led Russian brigade captured four of the round of 16 berths at the Australian Open on Friday
The Belgian ace made the semi-finals of the Acura Classic along with Justine Henin-Hardenne and Lindsay Davenport.
Defending champion Maria Sharapova was forced to drop a set before beating Patty Schnyder in the season-ending WTA Championships.
The Wimbledon champion beat Kristina Brandi of Puerto Rico 6-1, 6-4 at the $1.3 million Montreal Cup.
Top seed Maria Sharapova won her seventh straight match on US soil by defeating holder Elena Dementieva 6-3 6-4 in the quarter-finals of the Los Angeles Classic on Friday.