LONDON, June 28 (Xinhua) -- China's Zheng Jie pulled off one of the biggest upset at the All England Club on Friday when she beat top-seeded Ana Ivanovic in straight sets in the third round of the Wimbledon Open. Ivanovic, who took over the No. 1 ranking after winning the French Open earlier this month, slumped to a 6-1, 6-4 loss to the wild-card entry and doubles specialist.

Ivanovic, who saved two match points before overcoming Nathalie Dechy in three sets on Wednesday, had no answer for the hard-hitting Zheng.

"It's a surprise for me," said the 24-year-old Zheng, who won the Wimbledon doubles title in 2006. "Thanks to Wimbledon, (which)gave me a wild card. I just tried my best and had to keep going, going."

Zheng Jie of China returns the ball to Ana Ivanovic of Serbia during their match at the Wimbledon tennis championships in London June 27, 2008

It was the earliest exit by a women's top-seeded player at Wimbledon since Martina Hingis lost in the first round to Jelena Dokic in 2001.

Ivanovic exited a day after 2004 champion and third-seeded Maria Sharapova was ousted by 154th-ranked Alla Kudryavtseva and two-time men's runner-up Andy Roddick was ousted by Janko Tipsarevic. A day earlier, Australian Open champion and No. 3-ranked Novak Djokovic fell to Marat Safin.

Ivanovic committed 17 unforced errors, converted only one of seven break-point chances and lost serve four times.

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