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The 21-year-old Czech held off a late fightback from the Serb to book a spot in the quarterfinals for the second year in a row.
After failing to serve out the match at 5-4 Kvitova kept her nerve in the tiebreaker, helped in part by two double faults from her opponent, to clinch it 7-2.
She awaits the winner of the match between Jie Zheng and Sara Errani for a place in the semifinals.
More to come ...
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