2019 ATP Lyon Open – Singles

Dominic Thiem was the defending champion, but he chose not to defend his title this year.

Benoît Paire won the title, defeating Félix Auger-Aliassime in the final, 6–4, 6–3.

Seeds
The top four seeds receive a bye into the second round. • # Nikoloz Basilashvili (semifinals)

• # 🇪🇸 Roberto Bautista Agut (quarterfinals)

• # 🇨🇦 Denis Shapovalov (quarterfinals)

• # 🇨🇦 Félix Auger-Aliassime (final)

• # 🇷🇸 Dušan Lajović (first round)

• # 🇫🇷 Richard Gasquet (second round, withdrew)

• # 🇫🇷 Pierre-Hugues Herbert (second round)

• # 🇵🇱 Hubert Hurkacz (first round)

Seeds
• # Lloyd Harris (qualifying competition, Lucky loser)

• # 🇰🇿 Alexander Bublik (first round)

• # 🇨🇿 Jiří Veselý (qualified)

• # 🇦🇺 Alexei Popyrin (first round)

• # 🇫🇷 Grégoire Barrère (qualifying competition)

• # 🇫🇷 Antoine Hoang (first round)

• # 🇫🇷 Quentin Halys (qualifying competition)

• # 🇫🇷 Maxime Janvier (qualified)

Qualifiers
• # 🇫🇷 Maxime Janvier

• # 🇮🇹 Jannik Sinner

• # 🇨🇿 Jiří Veselý

• # 🇨🇦 Steven Diez

Lucky losers
• # Lloyd Harris

• # 🇫🇷 Tristan Lamasine