Serbia's player Novak Djokovic speaks to journalists during a training session in Belgrade, Serbia on May 2, 2018. (Photo by Pedja MILOSAVLJEVIC / AFP) (Photo credit should read PEDJA MILOSAVLJEVIC/AFP/Getty Images)
Serbia's player Novak Djokovic speaks to journalists during a training session in Belgrade, Serbia on May 2, 2018. (Photo by Pedja MILOSAVLJEVIC / AFP) (Photo credit should read PEDJA MILOSAVLJEVIC/AFP/Getty Images)