2020 ATP Finals – Singles

Daniil Medvedev defeated Dominic Thiem in the final, 4–6, 7–6(7–2), 6–4 to win the singles tennis title at the 2020 ATP Finals. Medvedev became the fourth man to defeat the world's top-three ranked players en route to a title (after David Nalbandian, Novak Djokovic and Boris Becker).

Stefanos Tsitsipas was the defending champion, but was eliminated in the round-robin stage. This marked the first time since 2009 that the defending champion was eliminated in the round-robin stage.

Novak Djokovic was attempting to equal Roger Federer's record of six Tour Finals titles, but was defeated by Thiem in the semifinals. His loss guaranteed a maiden ATP Finals titleist for the fifth consecutive year. Rafael Nadal was attempting to become only the second man (after Andre Agassi) to complete the career Super Slam, but was defeated by Medvedev in the semifinals. Despite qualifying with the world No. 5 ranking, Federer was absent due to an ongoing knee injury.

Andrey Rublev and Diego Schwartzman made their tournament debuts.

Seeds
• # 🇷🇸 Novak Djokovic (semifinals)

• # 🇪🇸 Rafael Nadal (semifinals)

• # 🇦🇹 Dominic Thiem (final)

• # 🇷🇺 Daniil Medvedev (champion)

• # 🇩🇪 Alexander Zverev (round robin)

• # Stefanos Tsitsipas (round robin)

• # 🇷🇺 Andrey Rublev (round robin)

• # 🇦🇷 Diego Schwartzman (round robin)

Alternates
• # 🇮🇹 Matteo Berrettini (Did not play)

• # 🇨🇦 Denis Shapovalov (Did not play)

Group London 2020
''Standings are determined by: 1. number of wins; 2. number of matches; 3. in two-players-ties, head-to-head records; 4. in three-players-ties, percentage of sets won, then percentage of games won; 5. ATP rankings.''