2023 Croatia Open Umag – Singles

Alexei Popyrin defeated Stan Wawrinka in the final, 6–7(5–7), 6–3, 6–4 to win the singles tennis title at the 2023 Croatia Open Umag. It was his second ATP Tour singles title.

Jannik Sinner was the reigning champion, but chose not to defend his title.

Seeds
The top four seeds received a bye into the second round. • #🇨🇿 Jiří Lehečka (quarterfinals)

• #🇮🇹 Lorenzo Sonego (semifinals)

• #🇦🇹 Sebastian Ofner (second round)

• #🇪🇸 Roberto Carballés Baena (quarterfinals)

• #🇦🇺 Christopher O'Connell (first round)

• # Stan Wawrinka (final)

• #🇮🇹 Matteo Arnaldi (semifinals)

• #🇪🇸 Albert Ramos Viñolas (first round)

Seeds
• # Alejandro Tabilo (first round)

• # Tomás Barrios Vera (qualifying competition)

• # 🇮🇹 Andrea Vavassori (first round)

• # 🇰🇿 Timofey Skatov (qualifying competition)

• # 🇦🇷 Facundo Bagnis (qualified)

• # 🇦🇹 Filip Misolic (qualified)

• # 🇮🇹 Raúl Brancaccio (first round)

• # 🇮🇹 Luca Nardi (first round)

Qualifiers
• # 🇦🇹 Filip Misolic

• # Jesper de Jong

• # 🇮🇹 Flavio Cobolli

• # 🇦🇷 Facundo Bagnis