Dementieva let early leads slip in all three set before emerging with a 5-7, 6-4, 6-4 victory over the feisty Mirza, who made the most of Dementieva's characteristically inconsistent serve.
Sixth-seeded Italian Flavia Pennetta literally tumbled out of the tournament, spraining her right ankle in the opening game of her third-round match against Emma Laine. After Laine won the game, Pennetta retired, sending the unseeded Finn into the fourth round.
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