2023 National Bank Open – Men's singles

Jannik Sinner defeated Alex de Minaur in the final, 6–4, 6–1 to win the men's singles title at the 2023 Canadian Open. It was his first ATP Tour Masters 1000 title and eighth ATP Tour singles title overall.

Pablo Carreño Busta was the reigning champion, but withdrew before the tournament began due to injury.

Seeds
The top eight seeds received a bye into the second round. • 🇪🇸 Carlos Alcaraz (quarterfinals)

• Daniil Medvedev (quarterfinals)

• 🇳🇴 Casper Ruud (third round)

• Stefanos Tsitsipas (second round)

• Holger Rune (second round)

• Andrey Rublev (second round)

• 🇮🇹 Jannik Sinner (champion)

• 🇺🇸 Taylor Fritz (third round)

• 🇺🇸 Frances Tiafoe (first round)

• 🇨🇦 Félix Auger-Aliassime (first round)

• 🇬🇧 Cameron Norrie (first round)

• 🇺🇸 Tommy Paul (semifinals)

• 🇩🇪 Alexander Zverev (second round)

• Borna Ćorić (first round)

• 🇵🇱 Hubert Hurkacz (third round)

• 🇮🇹 Lorenzo Musetti (third round)

Finals


Seeded players
The following are the seeded players. Seedings are based on ATP rankings as of 31 July 2023. Rank and points before are as of 7 August 2023.

† The player did not qualify for the event in 2022. Points from his 19th best result will be deducted instead.

Withdrawn players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

Wild cards
• 🇨🇦 Gabriel Diallo

• 🇨🇦 Alexis Galarneau

• 🇨🇦 Vasek Pospisil

• 🇨🇦 Milos Raonic

Protected ranking
• 🇫🇷 Gaël Monfils

Withdrawals
• 🇪🇸 Roberto Bautista Agut → replaced by 🇫🇷 Grégoire Barrère

• 🇪🇸 Pablo Carreño Busta → replaced by 🇺🇸 J. J. Wolf

• Marin Čilić → replaced by 🇨🇳 Zhang Zhizhen

• 🇧🇬 Grigor Dimitrov → replaced by 🇦🇺 Aleksandar Vukic

• 🇷🇸 Novak Djokovic → replaced by 🇺🇸 Christopher Eubanks

•  Karen Khachanov → replaced by  Aslan Karatsev

• 🇦🇺 Nick Kyrgios → replaced by 🇫🇮 Emil Ruusuvuori

• 🇨🇦 Denis Shapovalov → replaced by 🇺🇸 Mackenzie McDonald

• 🇩🇪 Jan-Lennard Struff → replaced by 🇪🇸 Bernabé Zapata Miralles

Seeds
• # 🇦🇺 Aleksandar Vukic (qualifying competition, lucky loser)

• # 🇮🇹 Matteo Arnaldi (qualified)

• # 🇺🇸 Marcos Giron (qualified)

• # 🇦🇺 Christopher O'Connell (qualifying competition)

• # 🇦🇺 Max Purcell (qualified)

• # 🇫🇷 Corentin Moutet (qualifying competition)

• # 🇦🇺 Thanasi Kokkinakis (qualified)

• # 🇦🇷 Diego Schwartzman (qualified)

• # 🇺🇸 Maxime Cressy (first round)

• # 🇲🇩 Radu Albot (qualifying competition)

• # 🇯🇵 Yosuke Watanuki (withdrew)

• # Cristian Garín (qualified)

• # 🇫🇷 Constant Lestienne (qualifying competition)

• # 🇯🇵 Taro Daniel (qualified)

Qualifiers
• # 🇦🇷 Diego Schwartzman

• # 🇮🇹 Matteo Arnaldi

• # 🇺🇸 Marcos Giron

• # Cristian Garín

• # 🇦🇺 Max Purcell

• # 🇯🇵 Taro Daniel

• # 🇦🇺 Thanasi Kokkinakis

Lucky loser
• # 🇦🇺 Aleksandar Vukic