
Greece's Stefanos Tsitsipas talks to the umpire during the ATP Madrid Open semi-final tennis match against Spain's Rafael Nadal at the Caja Magica in Madrid on May 11, 2019. (Photo by OSCAR DEL POZO / AFP via Getty Images)

Greece's Stefanos Tsitsipas talks to the umpire during the ATP Madrid Open semi-final tennis match against Spain's Rafael Nadal at the Caja Magica in Madrid on May 11, 2019. (Photo by OSCAR DEL POZO / AFP via Getty Images)