2023 Porto Open – Singles

Altuğ Çelikbilek was the two-time defending champion but lost in the second round to Antoine Escoffier.

Luca Nardi won the title after defeating João Sousa 5–7, 6–4, 6–1 in the final.

Seeds
• # 🇫🇷 Quentin Halys (first round)

• # 🇫🇷 Benjamin Bonzi (first round)

• # 🇫🇷 Hugo Grenier (first round)

• # 🇮🇹 Luca Nardi (champion)

• # 🇮🇹 Mattia Bellucci (first round)

• # 🇺🇸 Emilio Nava (second round)

• # 🇫🇷 Antoine Escoffier (semifinals)

• # 🇱🇹 Ričardas Berankis (first round)