Serbia's Ana Ivanovic reacts during her match against Bulgaria's Tsvetana Pironkova in the fourth round of play at the 2012 US Open tennis tournament, Monday, Sept. 3, 2012, in New York. (AP Photo/Kathy Willens)

Associated Press
Serbia's Ana Ivanovic reacts during her match against Bulgaria's Tsvetana Pironkova in the fourth round of play at the 2012 US Open tennis tournament,  Monday, Sept. 3, 2012, in New York. (AP Photo/Kathy Willens)
Serbia's Ana Ivanovic reacts during her match against Bulgaria's Tsvetana Pironkova in the fourth round of play at the 2012 US Open tennis tournament, Monday, Sept. 3, 2012, in New York. (AP Photo/Kathy Willens)
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