Defending champion Maria Sharapova clinched a 6-1, 7-5 win over World No 43 Zheng Jie in a third round clash which witnessed 11 breaks of serve.
The Russian will take on Sloane Stephens for a place in the quarter-finals.
But the 26-year-old has work to do after firing down 34 unforced errors, an ugly tally which was at least partially soothed by her 25 winners.
Maria Sharapova
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