Stefanos Tsitsipas (born 12 August 1998) is a Greek professional tennis player who reached a career-high world No. 3 ranking in August 2021, making him the highest-ranked Greek male player in history. He has won 13 ATP Tour singles titles, including the 2019 ATP Finals and three Masters 1000 events, and has reached two Grand Slam finals—at the 2021 French Open and 2023 Australian Open—becoming the first Greek to achieve this feat. Born into a tennis family (his mother Julia was a WTA pro and his father Apostolos a coach), he started playing at age three and was a world No. 1 junior, winning the 2016 Wimbledon boys' doubles title. He burst onto the scene in 2018, winning his first ATP title in Stockholm and finishing runner-up at the Canadian Open, where he became the youngest player to defeat four top-ten opponents in a single tournament. Tsitsipas has also won the Monte-Carlo Masters three times (2021, 2022, 2024) and was named Greek Male Athlete of the Year in 2019.