2018 Sibiu Open – Singles

Cedrik-Marcel Stebe was the defending champion but chose not to defend his title.

Dragoș Dima won the title after defeating Jelle Sels 6–3, 6–2 in the final.

Seeds
• # 🇷🇸 Laslo Đere (semifinals, retired)

• # 🇦🇹 Dennis Novak (first round)

• # Pedro Sousa (quarterfinals)

• # 🇮🇹 Simone Bolelli (second round)

• # 🇦🇺 Marc Polmans (second round)

• # 🇮🇹 Gianluigi Quinzi (first round, retired)

• # 🇪🇸 Pedro Martínez (semifinals)

• # 🇨🇿 Lukáš Rosol (quarterfinals)