2018 The Hague Open – Singles

Guillermo García López was the defending champion but chose not to defend his title.

Thiemo de Bakker won the title after defeating Yannick Maden 6–2, 6–1 in the final.

Seeds
• # 🇩🇪 Yannick Maden (final)

• # 🇨🇿 Adam Pavlásek (first round)

• # 🇩🇪 Mats Moraing (first round)

• # 🇩🇪 Oscar Otte (quarterfinals)

• # 🇮🇹 Matteo Donati (first round)

• # 🇦🇷 Carlos Berlocq (withdrew)

• # 🇭🇺 Attila Balázs (quarterfinals)

• # 🇫🇷 Grégoire Barrère (first round)