2018 Generali Open Kitzbühel – Singles

Martin Kližan won the title, defeating Denis Istomin in the final, 6–2, 6–2. This was the second final in ATP history to be contested between two qualifiers, the first occurring at the 2015 Apia International Sydney.

Philipp Kohlschreiber was the defending champion, but lost in the second round to Istomin.

Seeds
The top four seeds receive a bye into the second round. • #🇦🇹 Dominic Thiem (second round)

• #🇩🇪 Philipp Kohlschreiber (second round)

• #🇪🇸 Fernando Verdasco (second round)

• # Robin Haase (second round)

• #🇫🇷 Gilles Simon (first round)

• #🇩🇪 Maximilian Marterer (quarterfinals)

• #🇩🇪 Jan-Lennard Struff (first round)

• #🇷🇸 Dušan Lajović (quarterfinals)

Seeds
• # 🇺🇿 Denis Istomin (qualified)

• # 🇩🇪 Yannick Hanfmann (qualified)

• # 🇦🇹 Gerald Melzer (qualifying competition)

• # Ernests Gulbis (first round)

• # 🇸🇰 Martin Kližan (qualified)

• # 🇦🇷 Guido Andreozzi (first round)

• # 🇩🇪 Yannick Maden (qualifying competition)

• # 🇮🇹 Lorenzo Sonego (qualifying competition)

Qualifiers
• # 🇺🇿 Denis Istomin

• # 🇩🇪 Yannick Hanfmann

• # 🇸🇰 Martin Kližan

• # 🇦🇹 Jurij Rodionov