2023 ATP Lyon Open – Singles

Arthur Fils defeated Francisco Cerúndolo in the final, 6–3, 7–5 to win the singles tennis title at the 2023 ATP Lyon Open. It was his first ATP Tour title.

Cameron Norrie was the defending champion, but lost in the semifinals to Cerúndolo.

Mikael Ymer was defaulted during his second-round match against Fils after he smashed the umpire's chair with his racket.

Seeds
The top four seeds receive a bye into the second round. • #🇨🇦 Félix Auger-Aliassime (quarterfinals, withdrew)

• #🇬🇧 Cameron Norrie (semifinals)

• #🇺🇸 Tommy Paul (quarterfinals)

• #🇦🇷 Francisco Cerúndolo (final)

• #🇷🇸 Miomir Kecmanović (second round)

• #🇦🇷 Sebastián Báez (quarterfinals)

• #🇫🇷 Richard Gasquet (first round)

• #🇺🇸 Brandon Nakashima (semifinals)

Seeds
• # 🇨🇳 Zhang Zhizhen (qualified)

• # 🇫🇷 Hugo Grenier (first round)

• # 🇦🇺 Dane Sweeny (first round)

• # 🇪🇸 Pablo Llamas Ruiz (qualified)

• # 🇦🇷 Hernán Casanova (first round)

• # 🇫🇷 Manuel Guinard (first round)

• # 🇪🇸 Oriol Roca Batalla (qualifying competition, lucky loser)

• # 🇵🇱 Daniel Michalski (first round)

Qualifiers
• # 🇨🇳 Zhang Zhizhen

• # 🇪🇸 Álvaro López San Martín

• # Lloyd Harris

• # 🇪🇸 Pablo Llamas Ruiz

Lucky loser
• # 🇪🇸 Oriol Roca Batalla