2018 Open Harmonie mutuelle – Singles

Egor Gerasimov was the defending champion but lost in the second round to Jürgen Zopp.

Ričardas Berankis won the title after defeating Constant Lestienne 6–2, 5–7, 6–4 in the final.

Seeds
• # 🇨🇾 Marcos Baghdatis (semifinals)

• # 🇱🇹 Ričardas Berankis (champion)

• # 🇸🇰 Lukáš Lacko (first round)

• # 🇺🇦 Sergiy Stakhovsky (first round)

• # 🇩🇪 Oscar Otte (first round)

• # 🇸🇪 Elias Ymer (second round)

• # 🇫🇷 Corentin Moutet (first round)

• # 🇪🇪 Jürgen Zopp (semifinals)