The Polish world No 4 and 2011 winner in Beijing managed to seal a 4-6 6-4 6-4 victory, despite a stiff test from her Swiss opponent, who is ranked 52 places behind her.
In the day's other matches, Lucie Safarova upset former US Open champion Samantha Stosur for the second time in less than a week, to record her eighth victory in their last 10 meetings.
The left-handed Czech had already beaten the 15th seeded Australian in the third round of the WTA Toray Pan Pacific Open in Tokyo earlier in the week and came through the lastest encounter 7-5 6-3.
Meanwhile, fourth seed and home favourite Li Na swept past veteran Daniela Hantuchova 6-0 6-4 to the delight of the Olympic Park crowd.
Estonia's Kaia Kanepi claimed victory over Germany's Julia Goerges 7-5 6-4 while big-serving American teenager Madison Keys upset Dominika Cibulkova from Slovakia 6-4 6-3.
World No 1 Serena Williams plays her first match since winning the US Open when she meets Russian Elena Vesnina in the first round later.
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