2017 Japan Women's Open – Singles

Christina McHale was the defending champion, but lost in the semifinals to Zarina Diyas.

Qualifier Diyas went on to win her first WTA title, defeating another qualifier Miyu Kato in the final, 6–2, 7–5.

Former world no. 4 Kimiko Date played her last professional match at this tournament, losing in straight sets to Aleksandra Krunić in the first round.

Seeds
• #🇫🇷 Kristina Mladenovic (first round)

• #🇨🇳 Zhang Shuai (second round)

• #🇧🇪 Elise Mertens (quarterfinals)

• #🇨🇿 Kristýna Plíšková (second round)

• #🇦🇺 Samantha Stosur (first round)

• #🇯🇵 Naomi Osaka (first round)

• #🇺🇸 Alison Riske (second round)

• #🇰🇿 Yulia Putintseva (quarterfinals)

Seeds
• #🇲🇪 Danka Kovinić (qualified)

• #🇰🇿 Zarina Diyas (qualified)

• #🇺🇸 Kristie Ahn (first round)

• # Jana Fett (qualified)

• #🇦🇺 Arina Rodionova (second round)

• #🇰🇷 Jang Su-jeong (second round)

• # Arantxa Rus (first round)

• # Quirine Lemoine (second round)

Qualifiers
• #🇲🇪 Danka Kovinić

• #🇰🇿 Zarina Diyas

• #🇯🇵 Miyu Kato

• # Jana Fett