2023 International Challenger Zhangjiagang – Singles

Marc Polmans was the defending champion but chose not to defend his title.

Térence Atmane won the title after defeating Mikalai Haliak 6–1, 6–2 in the final.

Seeds
• # 🇨🇳 Bu Yunchaokete (first round)

• # 🇫🇷 Térence Atmane (champion)

• # 🇯🇵 Kaichi Uchida (first round)

• # 🇯🇵 Rio Noguchi (first round)

• # 🇦🇺 Li Tu (quarterfinals)

• # Jason Jung (withdrew)

• # 🇱🇹 Ričardas Berankis (semifinals)

• # 🇦🇺 James McCabe (semifinals, retired)