The 2020 ATP Finals (also known as the 2020 Nitto ATP Finals for sponsorship reasons) was a men's tennis tournament played at the O2 Arena in London, United Kingdom, from 15 to 22 November 2020. It was the season-ending event for the highest-ranked singles players and doubles teams on the 2020 ATP Tour. This was the final year that London hosted the event. On 14 August 2020, it was announced the tournament would be held without spectators in attendance following guidelines imposed due to the COVID-19 pandemic in the United Kingdom.

Daniil Sergeyevich Medvedev is a Russian professional tennis player. He has been ranked as high as world No. 1 in men's singles by the Association of Tennis Professionals (ATP), and is the current world No. 4. Medvedev has won 20 ATP Tour singles titles, including the 2021 US Open and 2020 ATP Finals. Medvedev defeated world No. 1 Novak Djokovic in the final to deny him the Grand Slam. In the latter, he became the only player to defeat the top three ranked players in the world en route to the year-end championship title. He has also won six Masters titles and contested six major finals. His six Masters titles all came in different venues, making him only the sixth player to win Masters titles at six different venues.