2018 Banja Luka Challenger – Singles

Maximilian Marterer was the defending champion but chose not to defend his title.

Alessandro Giannessi won the title after defeating Carlos Berlocq 6–7(6–8), 6–4, 6–4 in the final.

Seeds
• # 🇦🇷 Juan Ignacio Londero (quarterfinals)

• # 🇪🇸 Pablo Andújar (quarterfinals)

• # 🇦🇷 Marco Trungelliti (first round)

• # 🇪🇸 Daniel Gimeno Traver (quarterfinals)

• # 🇸🇰 Andrej Martin (first round)

• # Christian Garín (second round, withdrew)

• # 🇦🇷 Carlos Berlocq (final)

• # 🇪🇸 Pedro Martínez (first round)