2019 Open Harmonie mutuelle – Singles

Ričardas Berankis was the defending champion but lost in the semifinals to Kamil Majchrzak.

Majchrzak won the title after defeating Maxime Janvier 6–3, 7–6(7–1) in the final.

Seeds
All seeds receive a bye into the second round. • # 🇱🇹 Ričardas Berankis (semifinals)

• # 🇩🇪 Yannick Maden (withdrew)

• # 🇫🇷 Grégoire Barrère (quarterfinals)

• # 🇷🇺 Evgeny Donskoy (quarterfinals)

• # 🇮🇹 Stefano Travaglia (second round)

• # 🇫🇷 Corentin Moutet (semifinals)

• # 🇫🇷 Antoine Hoang (quarterfinals)

• # 🇵🇱 Kamil Majchrzak (champion)

• # 🇦🇹 Dennis Novak (third round)

• # 🇪🇪 Jürgen Zopp (second round)

• # 🇫🇷 Quentin Halys (second round)

• # 🇧🇦 Mirza Bašić (third round)

• # 🇩🇪 Daniel Brands (second round)

• # 🇦🇹 Sebastian Ofner (third round)

• # 🇰🇿 Aleksandr Nedovyesov (second round, retired)

• # 🇸🇰 Filip Horanský (third round)