2023 Open de Oeiras II – Singles

Zsombor Piros was the defending champion but chose not to defend his title.

Facundo Díaz Acosta won the title after defeating Aleksandar Vukic 6–4, 6–3 in the final.

Seeds
• # 🇦🇷 Pedro Cachin (quarterfinals)

• # 🇫🇷 Hugo Gaston (first round, retired)

• # 🇲🇩 Radu Albot (quarterfinals)

• # 🇪🇨 Emilio Gómez (first round)

• # 🇦🇷 Facundo Bagnis (first round)

• # 🇦🇺 Aleksandar Vukic (final)

• # 🇦🇷 Facundo Díaz Acosta (champion)

• # 🇦🇺 Rinky Hijikata (first round)