Jannik Sinner is an Italian professional tennis player. He is ranked as the world No. 1 in singles by the Association of Tennis Professionals (ATP), the first Italian player to reach the top ranking. Sinner has won 16 singles titles on the ATP Tour, including two majors at the 2024 Australian Open and the 2024 US Open, as well as three Masters 1000 titles. Sinner was runner-up at the 2023 ATP Finals and led Italy to the 2023 Davis Cup crown, its first since 1976. He has a career-high ranking of world No. 124 in doubles, achieved in September 2021, and has one ATP Tour title in doubles.