2023 Kobe Challenger – Singles

Yosuke Watanuki was the defending champion but chose not to defend his title.

Duje Ajduković won the title after defeating Sho Shimabukuro 6–4, 6–2 in the final.

Seeds
• # 🇦🇹 Jurij Rodionov (quarterfinals)

• # 🇯🇵 Shintaro Mochizuki (quarterfinals)

• # 🇮🇹 Luca Nardi (semifinals)

• # 🇩🇪 Benjamin Hassan (second round)

• # 🇯🇵 Sho Shimabukuro (final)

• # 🇦🇺 Marc Polmans (quarterfinals)

• # 🇨🇳 Bu Yunchaokete (withdrew)

• # 🇨🇿 Zdeněk Kolář (first round)