2023 Wolffkran Open – Singles

Quentin Halys was the defending champion but chose not to defend his title.

Antoine Bellier won the title after defeating Maximilian Marterer 7–6(7–5), 6–7(5–7), 7–6(8–6) in the final.

Seeds
• # Dominic Stricker (second round, retired)

• # 🇩🇪 Maximilian Marterer (final)

• # 🇺🇸 Maxime Cressy (first round)

• # Lloyd Harris (withdrew)

• # 🇧🇦 Damir Džumhur (first round)

• # 🇬🇧 Jan Choinski (first round)

• # 🇺🇦 Vitaliy Sachko (first round)

• # Marc-Andrea Hüsler (quarterfinals)

• # 🇫🇷 Harold Mayot (first round)