2020 Shimadzu All Japan Indoor Tennis Championships – Singles

Ylena In-Albon was the defending champion, but chose not to participate.

Xun Fangying won the title, defeating Indy de Vroome in the final, 3–6, 6–3, 7–6(8–6).

Seeds
• # 🇨🇳 Wang Xinyu (semifinals)

• # 🇦🇺 Arina Rodionova (first round)

• # 🇨🇳 Xun Fangying (champion)

• # Indy de Vroome (final)

• # 🇯🇵 Kyōka Okamura (second round)

• # 🇯🇵 Akiko Omae (quarterfinals)

• # 🇹🇭 Peangtarn Plipuech (first round)

• # 🇯🇵 Ayano Shimizu (quarterfinals)