2023 Zug Open – Singles

Dominic Stricker was the defending champion but lost in the first round to Joris De Loore.

Arthur Rinderknech won the title after defeating De Loore 3–6, 6–3, 6–4 in the final.

Seeds
• # 🇫🇷 Arthur Rinderknech (champion)

• # Dominic Stricker (first round)

• # 🇦🇹 Jurij Rodionov (semifinals)

• # 🇮🇹 Fabio Fognini (semifinals)

• # 🇫🇮 Otto Virtanen (second round)

• # 🇫🇷 Harold Mayot (second round)

• # Alexander Ritschard (second round)

• # 🇧🇬 Dimitar Kuzmanov (second round)