Stefanos Tsitsipas (Greek: Στέφανος Τσιτσιπάς, pronounced [ˈstefanos t͡sit͡siˈpas];[2] born 12 August 1998) is a Greek professional tennis player. He is the youngest player ranked in the top 10 by the Association of Tennis Professionals (ATP) and has a career-high ranking of No. 5 in the world, making him the highest-ranked Greek player in history. Tsitsipas was the champion at the 2019 ATP Finals, becoming the youngest winner of the year-end championships in eighteen years.