Djokovic next will face sixth seed Robin Soderling who beat Croat Ivan Ljubicic 7-6(3), 6-4.

In the elite WTA tournament, China's Peng Shuai, 53rd ranked in the world, did not continue with her giant-killing run as she was stopped by Russia's 13th seed Nadia Petrova 6-7(5), 6-3, 6-2 in the quarterfinals.

Peng Shuai of China reacts during the quarter-final match of women's singles against Nadia Petrova of Russia at China Tennis Open Tournament 2009 at National Tennis Centre in Beijing, capital of China, Oct. 9, 2009. Peng lost 1-2.

Peng, who beat top seeds Jelena Jankovic and Maria Sharapova onher road to the last eight, broke Petrova's first serve for a 2-0 lead in the opening set, but Petrova broke back in the fourth gameto level the match. At 6-5, Petrova threatened to close up the set earlier while forcing a break point in the 10th set on Peng's serve, but the 23-year-old Chinese girl, who produced an impressive display of baseline work, held serve and won the following tiebreak at 7-5.

Peng seemed to have trouble in moving with her left leg, called medical timeout at 1-1 in the second set, which did not help.

The Russian broke in the seventh and ninth games to pull back one set at 6-3.

Petrova, physically in good shape after battling through second seed Serena Williams in the last round only 15 hours ago, had a much easier time of it in the final set.

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