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ISTANBUL, TURKEY – OCTOBER 20: Sara Errani of Italy, Agnieszka Radwanska of Poland, Petra Kvitova of Czech Republic, Serena Williams of the Unted States, Victoria Azarenka of Belarus, Na Li of China, Jelana Jankovic of Serbia and Angelique Kerber of Germany pose for a group picture before the draw ceremony at the Renaissance Polat Hotel on October 20, 2013 in Istanbul, Turkey. (Photo by Matthew Stockman/Getty Images)