2018 Marburg Open – Singles

Filip Krajinović was the defending champion but chose not to defend his title.

Juan Ignacio Londero won the title after defeating Hugo Dellien 3–6, 7–5, 6–4 in the final.

Seeds
• # 🇪🇪 Jürgen Zopp (second round)

• # 🇩🇪 Yannick Hanfmann (first round)

• # 🇧🇴 Hugo Dellien (final)

• # 🇧🇷 Thiago Monteiro (second round)

• # Pedro Sousa (second round)

• # 🇧🇷 Rogério Dutra Silva (first round)

• # 🇷🇺 Alexey Vatutin (second round)

• # Henri Laaksonen (second round)