2023 Seoul Open Challenger – Singles

Li Tu was the defending champion but lost in the first round to Emilio Gómez.

Bu Yunchaokete won the title after defeating Aleksandar Vukic 7–6(7–4), 6–4 in the final.

Seeds
• # 🇦🇺 Max Purcell (second round)

• # 🇺🇸 Christopher Eubanks (quarterfinals)

• # 🇦🇺 Jordan Thompson (second round)

• # 🇦🇺 James Duckworth (second round)

• # 🇪🇨 Emilio Gómez (second round)

• # 🇦🇺 Rinky Hijikata (quarterfinals)

• # 🇦🇺 Aleksandar Vukic (final)

• # 🇺🇸 Denis Kudla (quarterfinals)