2023 Hamburg European Open – Men's singles

Alexander Zverev defeated Laslo Djere in the final, 7–5, 6–3 to win the men's singles tennis title at the 2023 Hamburg European Open in his hometown of Hamburg.

Lorenzo Musetti was the defending champion, but lost to Djere in the quarterfinals.

Seeds
• #🇳🇴 Casper Ruud (quarterfinals)

• # Andrey Rublev (second round)

• #🇮🇹 Lorenzo Musetti (quarterfinals)

• #🇩🇪 Alexander Zverev (champion)

• #🇦🇷 Francisco Cerúndolo (first round, retired)

• #🇦🇷 Tomás Martín Etcheverry (first round)

• #🇪🇸 Alejandro Davidovich Fokina (second round)

• #🇷🇸 Miomir Kecmanović (first round)

Seeds
• # 🇨🇴 Daniel Elahi Galán (qualifying competition, lucky loser)

• # Pavel Kotov (first round)

• # Cristian Garín (qualified)

• # 🇧🇷 Thiago Seyboth Wild (qualified)

• # 🇧🇷 Thiago Monteiro (qualifying competition, lucky loser)

• # 🇦🇷 Thiago Agustín Tirante (first round)

• # 🇬🇧 Jan Choinski (qualified)

• # Ivan Gakhov (first round)

Qualifiers
• # 🇬🇧 Jan Choinski

• # 🇸🇪 Elias Ymer

• # Cristian Garín

• # 🇧🇷 Thiago Seyboth Wild

Lucky losers
• # 🇨🇴 Daniel Elahi Galán

• # 🇧🇷 Thiago Monteiro

• # 🇸🇰 Jozef Kovalík