2023 Sparkassen ATP Challenger – Singles

Borna Gojo was the defending champion but chose not to defend his title.

Lukáš Klein won the title after defeating Maks Kaśnikowski 6–7(4–7), 7–6(7–4), 7–6(8–6) in the final.

Seeds
• # 🇯🇴 Abdullah Shelbayh (second round)

• # 🇧🇪 Gauthier Onclin (first round)

• # 🇮🇹 Federico Gaio (semifinals)

• # 🇮🇹 Francesco Maestrelli (first round)

• # 🇪🇪 Mark Lajal (second round)

• # 🇪🇸 Alejandro Moro Cañas (first round)

• # 🇮🇹 Stefano Napolitano (first round)

• # 🇺🇦 Illya Marchenko (second round)