2023 Koper Open – Singles

Kathinka von Deichmann was the defending champion but chose not to participate.

Aliona Bolsova won the title after Irina Bara retired in the final at 3–6, 6–2, 4–1.

Seeds
All seeds receive a bye into the second round. • # 🇮🇹 Jasmine Paolini (third round)

• # 🇫🇷 Léolia Jeanjean (second round)

• # 🇭🇺 Réka Luca Jani (quarterfinals)

• # 🇷🇸 Olga Danilović (third round)

• # Polina Kudermetova (second round)

• # Tara Würth (second round)

• # 🇪🇸 Aliona Bolsova (champion)

• # 🇮🇹 Nuria Brancaccio (third round)

• # 🇦🇺 Jaimee Fourlis (second round)

• # 🇷🇴 Jaqueline Cristian (semifinals)

• # 🇪🇸 Jéssica Bouzas Maneiro (quarterfinals)

• # Antonia Ružić (third round)

• # 🇲🇰 Lina Gjorcheska (second round)

• # 🇷🇴 Alexandra Cadanțu-Ignatik (second round)

• # Kristina Dmitruk (quarterfinals)

• # Tena Lukas (third round)