2017 Japan Women's Open

The 2017 Japan Women's Open (also known as the 2017 Hashimoto Sogyo Japan Women's Open for sponsorship reasons) was a women's tennis tournament played on outdoor hard courts. It was the ninth edition of the Japan Women's Open, and part of the WTA International tournaments of the 2017 WTA Tour. It was held at the Ariake Coliseum in Tokyo, Japan, from September 11 through September 17, 2017.

Prize money
1 Qualifiers prize money is also the Round of 32 prize money 2 Per team

Seeds

 * Rankings are as of August 28, 2017

Other entrants
The following players received wildcards into the singles main draw:
 * 🇯🇵 Kimiko Date
 * 🇫🇷 Kristina Mladenovic
 * 🇨🇿 Kristýna Plíšková

The following player received entry using a protected ranking:
 * 🇯🇵 Misa Eguchi

The following players received entry from the qualifying draw:
 * 🇰🇿 Zarina Diyas
 * Jana Fett
 * 🇯🇵 Miyu Kato
 * 🇲🇪 Danka Kovinić

Withdrawals

 * Before the tournament
 * 🇺🇸 Lauren Davis → replaced by 🇸🇰 Jana Čepelová
 * 🇸🇰 Magdaléna Rybáriková → replaced by 🇪🇸 Sara Sorribes Tormo
 * 🇨🇿 Kateřina Siniaková → replaced by 🇯🇵 Kurumi Nara
 * 🇷🇺 Natalia Vikhlyantseva → replaced by Richèl Hogenkamp
 * Donna Vekić → replaced by 🇨🇳 Han Xinyun
 * 🇨🇿 Markéta Vondroušová → replaced by 🇧🇾 Aliaksandra Sasnovich
 * 🇨🇳 Zheng Saisai → replaced by Hsieh Su-wei

Seeds

 * 1 Rankings are as of August 28, 2017

Other entrants
The following pairs received wildcards into the doubles main draw:
 * Chuang Chia-jung / 🇯🇵 Misaki Doi
 * 🇯🇵 Erina Hayashi / 🇯🇵 Momoko Kobori

Singles

 * 🇰🇿 Zarina Diyas def. 🇯🇵 Miyu Kato, 6–2, 7–5

Doubles

 * 🇯🇵 Shuko Aoyama / 🇨🇳 Yang Zhaoxuan def. 🇦🇺 Monique Adamczak / 🇦🇺 Storm Sanders, 6–0, 2–6, [10–5]