2018 Geneva Open – Singles

Stan Wawrinka was the two-time defending champion but lost to Márton Fucsovics in the quarterfinals.

Fucsovics went on to win his first ATP World Tour singles title, defeating Peter Gojowczyk in the final, 6–2, 6–2. Fucsovics became the first Hungarian player to win an ATP World Tour singles title since Balázs Taróczy in 1982.

Seeds
The top four seeds receive a bye into the second round. • # 🇺🇸 Sam Querrey (second round)

• # 🇮🇹 Fabio Fognini (semifinals)

• # Stan Wawrinka (quarterfinals)

• # 🇪🇸 David Ferrer (second round)

• # 🇪🇸 Albert Ramos Viñolas (first round)

• # 🇺🇸 Steve Johnson (semifinals)

• # 🇮🇹 Andreas Seppi (quarterfinals)

• # 🇩🇪 Mischa Zverev (first round)

Seeds
• # 🇪🇸 Pablo Andújar (qualifying competition)

• # Nino Serdarušić (first round)

• # 🇺🇸 Noah Rubin (qualified)

• # 🇮🇹 Matteo Donati (first round)

• # 🇩🇪 Jan Choinski (first round)

• # 🇩🇪 Dominik Köpfer (qualified)

• # 🇨🇿 Lukáš Rosol (qualified)

• # 🇪🇸 Bernabé Zapata Miralles (qualified)

Qualifiers
• # 🇩🇪 Dominik Köpfer

• # 🇨🇿 Lukáš Rosol

• # 🇺🇸 Noah Rubin

• # 🇪🇸 Bernabé Zapata Miralles