2018 Open de Rennes – Singles

Uladzimir Ignatik was the defending champion but lost in the first round to Alexey Vatutin.

Vasek Pospisil won the title after defeating Ričardas Berankis 6–1, 6–2 in the final.

Seeds
• # 🇷🇺 Mikhail Youzhny (second round)

• # 🇨🇦 Vasek Pospisil (champion)

• # Gastão Elias (first round)

• # 🇺🇦 Sergiy Stakhovsky (first round)

• # 🇩🇪 Dustin Brown (first round)

• # 🇫🇷 Quentin Halys (quarterfinals)

• # 🇱🇹 Ričardas Berankis (final)

• # 🇸🇰 Norbert Gombos (second round)