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Petra Kvitova, of the Czech Republic, waves to fans after defeating Jelena Ostapenko, of Latvia, during the first round of the U.S. Open tennis tournament, Monday, Aug. 29, 2016, in New York. (AP Photo/Andres Kudacki)

U.S. Open 2011

The U.S. Open is underway in Flushing Meadows, New York.