2018 Heilbronner Neckarcup – Singles

Filip Krajinović was the defending champion but chose not to defend his title.

Rudolf Molleker won the title after defeating Jiří Veselý 4–6, 6–4, 7–5 in the final.

Seeds
• # 🇦🇺 John Millman (first round)

• # 🇨🇿 Jiří Veselý (final)

• # 🇩🇪 Yannick Maden (second round)

• # 🇩🇪 Yannick Hanfmann (second round)

• # 🇪🇪 Jürgen Zopp (first round)

• # Henri Laaksonen (quarterfinals)

• # 🇷🇺 Alexey Vatutin (quarterfinals)

• # 🇸🇰 Norbert Gombos (first round)