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US Julia Boserup serves the ball to Czech Republic's Petra Kvitova during their qualification round match at the Roland Garros 2017 French Tennis Open on May 28, 2017 in Paris. / AFP PHOTO / Lionel BONAVENTURE (Photo credit should read LIONEL BONAVENTURE/AFP/Getty Images)

US Julia Boserup serves the ball to Czech Republic's Petra Kvitova during their qualification round match at the Roland Garros 2017 French Tennis Open on May 28, 2017 in Paris.  / AFP PHOTO / Lionel BONAVENTURE        (Photo credit should read LIONEL BONAVENTURE/AFP/Getty Images)