Stefanos Tsitsipas of Greece returns a ball to David Goffin of Belgium during the Millennium Estoril Open semifinal ATP 250 tennis tournament at the Clube de Tenis do Estoril in Estoril, Portugal on May 4, 2019. (Stefanos Tsitsipas won 2-1) (Photo by Pedro Fiúza/NurPhoto via Getty Images)
