2023 Ostra Group Open – Singles

Evan Furness was the defending champion but retired from his first round match against Gaël Monfils.

Zdeněk Kolář won the title after defeating Máté Valkusz 6–3, 6–2 in the final.

Seeds
• # 🇬🇧 Ryan Peniston (first round)

• # Ivan Gakhov (second round)

• # 🇨🇿 Vít Kopřiva (second round)

• # 🇫🇷 Geoffrey Blancaneaux (second round)

• # Alejandro Tabilo (withdrew)

• # 🇮🇹 Riccardo Bonadio (semifinals)

• # 🇺🇦 Oleksii Krutykh (second round)

• # 🇧🇦 Damir Džumhur (quarterfinals)

• # 🇨🇿 Dalibor Svrčina (second round)