2018 Sparkassen Open – Singles

Nicola Kuhn was the defending champion but lost in the first round to Yannick Hanfmann.

Hanfmann won the title after defeating Jozef Kovalík 6–2, 3–6, 6–3 in the final.

Seeds
• # Pablo Cuevas (quarterfinals)

• # 🇪🇸 Roberto Carballés Baena (quarterfinals)

• # 🇪🇸 Jaume Munar (first round)

• # 🇩🇪 Florian Mayer (first round)

• # 🇲🇩 Radu Albot (withdrew)

• # 🇪🇪 Jürgen Zopp (second round)

• # 🇩🇪 Yannick Hanfmann (champion)

• # 🇸🇰 Martin Kližan (first round)

• # 🇸🇰 Jozef Kovalík (final)