2015 Shimadzu All Japan Indoor Tennis Championships – Singles

Martin Fischer was the defending champion but decided not to participate.

Michał Przysiężny won the title defeating John Millman in the final, 6–3, 3–6, 6–3.

Seeds
• # 🇯🇵 Go Soeda (quarterfinals)

• # 🇯🇵 Tatsuma Ito (semifinals)

• # 🇯🇵 Yūichi Sugita (second round)

• # 🇦🇺 John Millman (final)

• # 🇯🇵 Hiroki Moriya (quarterfinals)

• # 🇨🇳 Zhang Ze (second round)

• # 🇵🇱 Michał Przysiężny (champion)

• # 🇦🇺 Benjamin Mitchell (second round)