Chinese Grand Slam winners Zheng Jie/Yan Zi gave more reasons to their compatriots to hail on Wednesday when the country is still in holiday spree celebrating the 60th anniversary of the founding of country.

The pair registered their second full sets win in 24 hours after beating six seeds German Anna-Lena Groenefeld and Swiss Patty Schnyder to advance into the women's doubles last four.

Zheng and Yan, who this season did not partner so much like before, had a stunning midnight win over Australia's second seeds Samantha Stosur/Rennae Stubbs early this morning after beating six match points.

Going to bed at around three o'clock this morning, the pair only had 12 hours to adjust and relax.

"It was like a miracle that I fell asleep soon after I lied down. It was exciting but I can do with it. It did not affect our form in today's match," said Zheng after the 4-6, 6-0, 10-5 victory.

"Our opponents had some plans for us so it is tough in the first set, but in the second set our coach told us to be consistent and made less mistakes. I think our chemistry is still there, that's the key to victory."

In men's part, second seed Novak Djokovic did not waste his time to beat fellow Serbian Viktor Troicki 6-3, 6-0 in the second round, while fourth seed Nikolay Davydenko of Russia earlier boosted his chances of reaching the ATP's season finale for a fifth time with a 6-1, 6-0 thrashing of Philipp Kohlschreiber from Germany.

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