Kristina Mladenovic, of France, returns a shot against Petra Kvitova, of the Czech Republic, during the opening round of the 2014 U.S. Open tennis tournament, Tuesday, Aug. 26, 2014, in New York. (AP Photo/Kathy Willens)

2014 US Open Tennis

Kristina Mladenovic, of France, returns a shot against Petra Kvitova, of the Czech Republic, during the opening round of the 2014 U.S. Open tennis tournament, Tuesday, Aug. 26, 2014, in New York. (AP Photo/Kathy Willens)

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