US Steve Johnson returns the ball to Croatia's Borna Coric during their tennis match at the Roland Garros 2017 French Open on May 31, 2017 in Paris. / AFP PHOTO / Lionel BONAVENTURE (Photo credit should read LIONEL BONAVENTURE/AFP/Getty Images)
US Steve Johnson returns the ball to Croatia's Borna Coric during their tennis match at the Roland Garros 2017 French Open on May 31, 2017 in Paris. / AFP PHOTO / Lionel BONAVENTURE (Photo credit should read LIONEL BONAVENTURE/AFP/Getty Images)