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PARIS, FRANCE - MAY 28: Julia Boserup of the United States and Petra Kvitova of the Czech Republic toss up prior to their ladies singles first round match on day one of the 2017 French Open at Roland Garros on May 28, 2017 in Paris, France. (Photo by Clive Brunskill/Getty Images)

PARIS, FRANCE - MAY 28:  Julia Boserup of the United States and Petra Kvitova of the Czech Republic toss up prior to their ladies singles first round match on day one of the 2017 French Open at Roland Garros on May 28, 2017 in Paris, France.  (Photo by Clive Brunskill/Getty Images)