Daniil Sergeyevich Medvedev is a Russian professional tennis player. He was formerly ranked as the world No. 1 in men's singles by the ATP. Medvedev has won 24 ATP Tour-level singles titles, including the 2021 US Open and 2020 ATP Finals. ATP world No. 1 from February 28, 2022 to March 20, 2022 — 3 weeks. Wiki link