2018 Lisboa Belém Open – Singles

Oscar Otte was the defending champion but chose not to defend his title.

Tommy Robredo won the title after defeating Cristian Garín 3–6, 6–3, 6–2 in the final.

Seeds
• # 🇯🇵 Taro Daniel (quarterfinals)

• # 🇦🇺 Alex de Minaur (first round)

• # Gastão Elias (withdrew)

• # Pedro Sousa (semifinals)

• # Marcelo Arévalo (first round)

• # 🇦🇹 Sebastian Ofner (semifinals)

• # 🇬🇧 Liam Broady (second round)

• # 🇪🇸 Jaume Munar (second round)