Training of Novak Djokovic from Serbia during first day of the Barcelona Open Banc Sabadell, on 23th April 2018 in Barcelona, Spain. (Photo by Urbanandsport/NurPhoto via Getty Images)
Training of Novak Djokovic from Serbia during first day of the Barcelona Open Banc Sabadell, on 23th April 2018 in Barcelona, Spain. (Photo by Urbanandsport/NurPhoto via Getty Images)