2023 US Open – Men's singles

Novak Djokovic defeated Daniil Medvedev in the final, 6–3, 7–6(7–5), 6–3 to win the men's singles tennis title at the 2023 US Open. It was his fourth US Open title and record-extending 24th men's singles major title overall. Djokovic became the oldest US Open men's singles champion in the Open Era, at 36 years and 111 days, as well as the first man to capture the Australian Open, the French Open, and the US Open in a season since Mats Wilander in 1988. By reaching a 47th men's singles major semifinal, Djokovic surpassed Roger Federer's all-time record, and, by reaching the final, he equaled Federer's record of reaching all major finals in a season three times.

Carlos Alcaraz was the defending champion, but lost in the semifinals to Medvedev. Alcaraz's loss marked the 15th consecutive year where the reigning US Open champion failed to defend the title, with Federer being the last man to do so in 2008.

Alcaraz and Djokovic were in contention for the world No. 1 singles ranking. By winning his first-round match, Djokovic regained the top ranking at the end of the tournament.

This was the final professional appearance of former world No. 8 John Isner. He lost in the second round to Michael Mmoh.

Seeds
• 🇪🇸 Carlos Alcaraz (semifinals)

• 🇷🇸 Novak Djokovic (champion)

• Daniil Medvedev (final)

•  Holger Rune (first round)

• 🇳🇴 Casper Ruud (second round)

• 🇮🇹 Jannik Sinner (fourth round)

•  Stefanos Tsitsipas (second round)

•  Andrey Rublev (quarterfinals)

• 🇺🇸 Taylor Fritz (quarterfinals)

• 🇺🇸 Frances Tiafoe (quarterfinals)

•  Karen Khachanov (first round)

• 🇩🇪 Alexander Zverev (quarterfinals)

• 🇦🇺 Alex de Minaur (fourth round)

• 🇺🇸 Tommy Paul (fourth round)

• 🇨🇦 Félix Auger-Aliassime (first round)

• 🇬🇧 Cameron Norrie (third round)

• 🇵🇱 Hubert Hurkacz (second round)

• 🇮🇹 Lorenzo Musetti (first round)

• 🇧🇬 Grigor Dimitrov (third round)

• 🇦🇷 Francisco Cerúndolo (second round)

• 🇪🇸 Alejandro Davidovich Fokina (third round)

• 🇫🇷 Adrian Mannarino (third round)

•  Nicolás Jarry (third round)

•  Tallon Griekspoor (first round)

• 🇰🇿 Alexander Bublik (first round)

• 🇬🇧 Dan Evans (third round)

•  Borna Ćorić (first round)

• 🇺🇸 Christopher Eubanks (second round)

• 🇫🇷 Ugo Humbert (first round)

• 🇦🇷 Tomás Martín Etcheverry (second round)

• 🇺🇸 Sebastian Korda (first round)

• 🇷🇸 Laslo Djere (third round)

Seeded players
The following are the seeded players. Seedings are based on ATP rankings as of August 21, 2023. Rankings and points before are as of August 28, 2023.

Withdrawn players
The following players would have been seeded, but withdrew before the tournament began.

Wild cards
• 🇫🇷 Benjamin Bonzi

• 🇦🇺 Rinky Hijikata

• 🇺🇸 John Isner

• 🇺🇸 Steve Johnson

• 🇺🇸 Alex Michelsen

• 🇺🇸 Michael Mmoh

• 🇺🇸 Ethan Quinn

• 🇺🇸 Learner Tien

Protected ranking
• 🇨🇦 Milos Raonic (33)

• 🇫🇷 Gaël Monfils (35)

• Lloyd Harris (47)

• 🇯🇵 Kei Nishikori (48)

• 🇧🇴 Hugo Dellien (73)

• 🇦🇷 Guido Pella (75)

• 🇨🇿 Jiří Veselý (94)

• 🇭🇺 Attila Balázs (101)

Qualifiers
• 🇫🇷 Enzo Couacaud

• 🇯🇵 Taro Daniel

• 🇫🇷 Titouan Droguet

• 🇫🇷 Hugo Gaston

• Borna Gojo

•  Hsu Yu-hsiou

• 🇧🇷 Felipe Meligeni Alves

• 🇨🇿 Jakub Menšík

• 🇺🇸 Nicolas Moreno de Alboran

• 🇺🇸 Emilio Nava

• 🇯🇵 Sho Shimabukuro

• 🇰🇿 Timofey Skatov

•  Dominic Stricker

• 🇺🇸 Zachary Svajda

• 🇮🇹 Stefano Travaglia

• 🇫🇮 Otto Virtanen

Lucky losers
• 🇫🇷 Arthur Cazaux

• 🇦🇺 James Duckworth

Withdrawals
• 🇸🇪 Mikael Ymer (51) → replaced by Alexander Shevchenko (96)

• 🇩🇪 Jan-Lennard Struff (24) → replaced by 🇦🇷 Facundo Díaz Acosta (97)

• 🇦🇺 Nick Kyrgios (37) → replaced by 🇦🇷 Diego Schwartzman (98)

• 🇪🇸 Pablo Carreño Busta (22) → replaced by 🇲🇩 Radu Albot (99)

• 🇺🇸 Reilly Opelka (33 PR) → replaced by 🇦🇷 Juan Manuel Cerúndolo (100)

•  Marin Čilić (21 PR) → replaced by 🇰🇷 Kwon Soon-woo (101)

• 🇨🇦 Denis Shapovalov (23) → replaced by 🇭🇺 Attila Balázs (101 PR)

• 🇪🇸 Roberto Bautista Agut (25) → replaced by 🇯🇵 Yosuke Watanuki (104)

• 🇯🇵 Kei Nishikori (48 PR) → replaced by 🇦🇺 James Duckworth (LL)

• 🇫🇮 Emil Ruusuvuori (48) → replaced by 🇫🇷 Arthur Cazaux (LL)