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PARIS, FRANCE - MAY 28: Petra Kvitova of the Czech Republic hits a backhand during the ladies singles first round match against Julia Boserup of the United States on day one of the 2017 French Open at Roland Garros on May 28, 2017 in Paris, France. (Photo by Adam Pretty/Getty Images)

PARIS, FRANCE - MAY 28:  Petra Kvitova of the Czech Republic hits a backhand during the ladies singles first round match against Julia Boserup of the United States on day one of the 2017 French Open at Roland Garros on May 28, 2017 in Paris, France.  (Photo by Adam Pretty/Getty Images)