2018 Open BNP Paribas Banque de Bretagne – Singles

Adrian Mannarino was the defending champion but chose not to defend his title.

Quentin Halys won the title after defeating Alexey Vatutin 6–3, 7–6(7–1) in the final.

Seeds
• # Stefanos Tsitsipas (semifinals)

• # 🇷🇺 Mikhail Youzhny (withdrew)

• # 🇧🇦 Mirza Bašić (second round)

• # 🇩🇪 Dustin Brown (second round)

• # 🇫🇷 Quentin Halys (champion)

• # 🇸🇰 Martin Kližan (second round)

• # 🇧🇾 Uladzimir Ignatik (second round)

• # 🇩🇪 Yannick Maden (second round)