2017 Shimadzu All Japan Indoor Tennis Championships – Singles

Yūichi Sugita was the defending champion but lost in the quarterfinals to Lloyd Harris.

Yasutaka Uchiyama won the title after defeating Blaž Kavčič 6–3, 6–4 in the final.

Seeds
• # 🇯🇵 Yūichi Sugita (quarterfinals)

• # Grega Žemlja (semifinals)

• # 🇧🇪 Ruben Bemelmans (second round)

• # 🇨🇳 Zhang Ze (second round)

• # 🇦🇺 Andrew Whittington (first round)

• # Blaž Kavčič (final)

• # 🇯🇵 Tatsuma Ito (second round)

• # 🇦🇷 Agustín Velotti (first round)