Unseeded Sania Mirza of India stunned No. 4 Nadia Petrova 6-2, 6-1 on Wednesday at the Acura Classic, which has lost two of its top three players in two days from an already-depleted field.
Mirza, ranked 59th in the world, had a surprisingly easy time with the ninth-ranked Petrova in the second-round match. She joins Peng Shuai of China and Mashona Washington of the US as unseeded players who knocked off highly ranked Russians early in the US$1.3 million tournament.
Peng was a 7-5, 6-4 winner on Tuesday over Elena Dementieva, seeded third and ranked sixth.
Washington defeated No. 8 Vera Zvonareva 6-4, 4-6, 6-4. Four Russian players advanced to the third round from the original 11 who entered the event.
No. 7 seed Kim Clijsters of Belgium cruised into the third round with a 6-3, 6-1 win over Poland's Marta Domachowska in the featured night match.
Clijsters, who beat Venus Williams on Sunday at Stanford, is looking for her fifth title of the season as she raised her record 39-5.
The tournament has lost three of its top four seeds, including No. 1 Lindsay Davenport, who withdrew with an injury on Sunday. Earlier injury pullouts were second-seeded Maria Sharapova, French Open champion and fifth-ranked Justine Henin-Hardenne, and seventh-ranked Serena Williams.
Mirza, who started the season ranked No. 169, had to win three matches in the qualifying tournament to get into the main draw.
"When you play a [highly ranked player,] nothing is easy," Mirza said. "Even if the score is love and love, I don't think it would have been an easy match. I knew that as soon as I would have relaxed, even for one second, she would have jumped on me."
In January, Mirza became the first Indian to take a WTA Tour title when she won in her country at Hyderabad.
With Petrova and Dementieva exiting early, the tournament has just two of the top-10-ranked players remaining -- No. 4 Svetlana Kuznetsova and No. 10 Kim Clijsters, who was playing Marta Domachowska of Poland in the featured night match.
Ai Sugiyama of Japan defeated doubles partner and 14th-seeded Daniela Hantuchova of Slovakia 7-5, 4-6, 6-2.
Sugiyama has a rich history of causing upsets in 11 appearances at Carlsbad. She's beaten five top-10 players, including Steffi Graf and Clijsters, and even Hantuchova in 2002. The Japanese veteran has also reached the quarterfinals in three of the previous four years. She'll next face Kuznetsova.
Sixth-seeded Mary Pierce of France breezed through to the third round with a 6-1, 6-1 victory over Anna-Lena Groenefeld.
Pierce, the French Open runner-up, had little trouble dispatching the German in her opening match after receiving a first-round bye.
"I was really happy, especially with my first set," two-time Grand Slam champion Pierce said.
"I took Anna-Lena extremely seriously because I had never played her in singles before. I came out from the beginning, the first point of the match, ready to play. It was nice to see how well I was playing," Pierce said.
A number of seeded players were pushed to three sets before finally winning, including No. 5 Patty Schnyder of Switzerland. Schnyder was a 6-4, 6-7 (2), 6-1 winner over Kveta Peschke of the Czech Republic.
Ninth-seeded Elena Likhovtseva of Russia, No. 10 Nathalie Dechy of France and No. 16 Dinara Safina of Russia also were extended before moving into the third round.
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