BEIJING, Sept. 19 -- Top seed Jelena Jankovic blazed into the quarterfinals of the Pan Pacific Open in Tokyo with a crushing 6-2, 6-1 victory over Italian Flavia Pennetta yesterday. But fellow Serb Ana Ivanovic suffered a shock exit when the French Open champion was upset 6-1, 1-6, 6-2 by Russian Nadia Petrova in her opening match on the shore of Tokyo Bay.

Jankovic, beaten by Serena Williams in the US Open final earlier this month, will recapture the world No. 1 ranking from the American if she wins in Japan.

She overpowered Pennetta in a match played under a closed roof because of an approaching typhoon, wrapping up an easy win with an ace after just 61 minutes.

"I would like to be No. 1 again," Jankovic told reporters. "But the most important thing is to finish the year as the No. 1 player."

Ana Ivanovic of Serbia celebrates winning the match against Vera Dushevina of Russia at the U.S. Open tennis tournament in Flushing Meadows, New York August 26, 2008

Jankovic faces Russian Svetlana Kuznetsova next after the fifth seed blew away Japan's Ayumi Morita 6-1, 6-1. Second seed Ivanovic, who had declared herself fully fit after withdrawing from last month's Beijing Olympics with a thumb injury, lost after an error-strewn performance.

"I haven't played many matches so I'm happy to get back playing again," she said. "It was obviously frustrating but the surface was very fast and she was going for her shots."

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