ESTORIL, PORTUGAL - MAY 04: Stefanos Tsitsipas from Greece in action during the match between Stefanos Tsitsipas from Greece and Roberto Carballes Baena from Spain for Millennium Estoril Open 2018 at Clube de Tenis do Estoril on May 04, 2018 in Estoril, Portugal. (Photo by Carlos Rodrigues/Getty Images)
