NEW YORK - AUGUST 27: Petra Kvitova of Czech Republic returns ball during 1st round match against Polona Hercog of Slovakia at US Open tennis tournament on August 27, 2012 in Flushing Meadows New York
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NEW YORK - AUGUST 27: Petra Kvitova of Czech Republic returns ball during 1st round match against Polona Hercog of Slovakia at US Open tennis tournament on August 27, 2012 in Flushing Meadows New York