2018 Slovak Open – Singles

Lukáš Lacko was the defending champion but lost in the second round to Egor Gerasimov.

Alexander Bublik won the title after defeating Lukáš Rosol 6–4, 6–4 in the final.

Seeds
• # 🇸🇰 Lukáš Lacko (second round)

• # 🇷🇺 Evgeny Donskoy (quarterfinals)

• # 🇮🇹 Lorenzo Sonego (second round)

• # 🇪🇸 Guillermo García López (second round)

• # 🇦🇷 Marco Trungelliti (first round)

• # 🇮🇳 Ramkumar Ramanathan (second round)

• # 🇨🇾 Marcos Baghdatis (second round)

• # 🇧🇪 Ruben Bemelmans (second round)