Daniil Sergeyevich Medvedev is a Russian professional tennis player. He is ranked world No. 2 by the Association of Tennis Professionals (ATP), which is his career-high singles ranking first achieved on 15 March 2021. He has won thirteen ATP Tour singles titles, including the 2021 US Open and 2020 ATP Finals. In the former, Medvedev defeated world No. 1 Novak Djokovic - in the most important match since 1969 - to deny him the calendar-year Grand Slam. In the latter, Medvedev became the first and only player to defeat the top three ranked players in the world en route to the year-end championship title. Medvedev was also the runner-up at the 2019 US Open, the 2021 Australian Open and the 2022 Australian Open. He is considered the leader of the new generation of men's tennis after the Big Four.