2018 Libéma Open – Men's singles

Gilles Müller was the defending champion, but lost in the second round to Matthew Ebden.

Richard Gasquet won the title, defeating Jérémy Chardy in the final, 6–3, 7–6(7–5).

Seeds
The top four seeds receive a bye into the second round. • # 🇫🇷 Adrian Mannarino (second round)

• # 🇫🇷 Richard Gasquet (champion)

• # 🇱🇺 Gilles Müller (second round)

• # 🇪🇸 Fernando Verdasco (quarterfinals)

• # Stefanos Tsitsipas (quarterfinals)

• # Robin Haase (second round)

• # 🇯🇵 Yūichi Sugita (second round)

• # 🇮🇹 Andreas Seppi (first round)

Seeds
• # 🇦🇺 Jordan Thompson (first round, retired)

• # 🇺🇸 Bjorn Fratangelo (first round)

• # 🇺🇸 Tim Smyczek (qualifying competition, lucky loser)

• # 🇺🇸 Donald Young (first round)

• # 🇩🇪 Dustin Brown (first round)

• # 🇺🇸 Bradley Klahn (first round)

• # 🇺🇸 Kevin King (qualifying competition, lucky loser)

• # 🇦🇺 Alex Bolt (qualified)

Qualifiers
• # Franko Škugor

• # 🇦🇺 Max Purcell

• # 🇦🇺 Bernard Tomic

• # 🇦🇺 Alex Bolt

Lucky losers
• # 🇺🇸 Tim Smyczek

• # 🇺🇸 Kevin King

• # 🇦🇺 John-Patrick Smith