NEW YORK - AUGUST 31: Angelique Kerber of Germany returns ball during 2nd round match against Agnieszka Radwanska of Poland at USTA Billie Jean King National Tennis Center on August 31, 2011 in NYC
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NEW YORK - AUGUST 31: Angelique Kerber of Germany returns ball during 2nd round match against Agnieszka Radwanska of Poland at USTA Billie Jean King National Tennis Center on August 31, 2011 in NYC