2023 Yokkaichi Challenger – Singles

Yosuke Watanuki was the defending champion but lost in the second round to Giovanni Fonio.

Zizou Bergs won the title after defeating Michael Mmoh 6–2, 7–6(7–2) in the final.

Seeds
• # 🇯🇵 Yosuke Watanuki (second round)

• # 🇦🇹 Jurij Rodionov (first round)

• # 🇺🇸 Michael Mmoh (final)

• # 🇧🇪 Zizou Bergs (champion)

• # 🇦🇺 Marc Polmans (semifinals)

• # 🇨🇿 Zdeněk Kolář (second round)

• # Leandro Riedi (first round)

• # Hsu Yu-hsiou (first round)