Petra Kvitova, of the Czech Republic, serves against Kristina Mladenovic, of France, 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

Petra Kvitova, of the Czech Republic, serves against Kristina Mladenovic, of France, 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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