# 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)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| Q | Jana Fett | 6 | 6$^1$ | 4 | | | | |
| Q | Miyu Kato | 4 | 7$^7$ | 6 | | | | |
| Q | Miyu Kato | 4 | 7$^7$ | 6 | Q | Miyu Kato | 2 | 5 |
| | | | | | Q | Zarina Diyas | 6 | 7 |
| | Christina McHale | 4 | 6 | 3 | Q | Zarina Diyas | 6 | 7 |
| Q | Zarina Diyas | 6 | 0 | 6 | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1/WC | K Mladenovic | 3 | 4 | | | | | | | | | | | | | | | |
| Q | J Fett | 6 | 6 | | Q | J Fett | 6 | 6 | | | | | | | | | | |
| | A Sasnovich | 3 | 0$^r$ | | | J Čepelová | 0 | 3 | | | | | | | | | | |
| | J Čepelová | 6 | 1 | | | | | | Q | J Fett | 6 | 4 | 6 | | | | | |
| | S-w Hsieh | 5 | 2 | | | | | | | Q Wang | 3 | 6 | 3 | | | | | |
| | Q Wang | 7 | 6 | | | Q Wang | 6 | 6 | | | | | | | | | | |
| | K Nara | 6 | 6 | | | K Nara | 2 | 3 | | | | | | | | | | |
| 6 | N Osaka | 3 | 0 | | | | | | | | | | | Q | J Fett | 6 | 6$^1$ | 4 |
| 4/WC | Kr Plíšková | 7 | 7 | | | | | | | | | | | Q | M Kato | 4 | 7$^7$ | 6 |
| | K-c Chang | 5 | 5 | | 4/WC | Kr Plíšková | 5 | 3 | | | | | | | | | | |
| Q | M Kato | 6 | 6 | | Q | M Kato | 7 | 6 | | | | | | | | | | |
| | N Hibino | 3 | 4 | | | | | | Q | M Kato | 6 | 6 | | | | | | |
| | A Krunić | 6 | 6 | | | | | | | A Krunić | 1 | 3 | | | | | | |
| WC | K Date | 0 | 0 | | | A Krunić | 6 | 6 | | | | | | | | | | |
| | M Brengle | 7 | 3 | 4 | 7 | A Riske | 3 | 4 | | | | | | | | | | |
| 7 | A Riske | 5 | 6 | 6 | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 5 | S Stosur | 6 | 5 | 1 | | | | | | | | | | | | | | |
| | S Sorribes Tormo | 3 | 7 | 6 | | S Sorribes Tormo | 1 | 1 | | | | | | | | | | |
| | C McHale | 6 | 6 | | | C McHale | 6 | 6 | | | | | | | | | | |
| Q | D Kovinić | 2 | 4 | | | | | | | C McHale | 6 | 6 | | | | | | |
| | R Ozaki | 1 | 5 | | | | | | 3 | E Mertens | 4 | 1 | | | | | | |
| | M Linette | 6 | 7 | | | M Linette | 1 | 5 | | | | | | | | | | |
| | E Rodina | 6$^6$ | 1 | | 3 | E Mertens | 6 | 7 | | | | | | | | | | |
| 3 | E Mertens | 7$^8$ | 6 | | | | | | | | | | | | C McHale | 4 | 6 | 3 |
| 8 | Y Putintseva | 6 | 4 | 6 | | | | | | | | | | Q | Z Diyas | 6 | 0 | 6 |
| | Y Duan | 4 | 6 | 4 | 8 | Y Putintseva | 6 | 2 | | | | | | | | | | |
| PR | M Eguchi | 5 | 2 | | | X Han | 2 | 0$^r$ | | | | | | | | | | |
| | X Han | 7 | 6 | | | | | | 8 | Y Putintseva | 6 | 1 | 3 | | | | | |
| Q | Z Diyas | 3 | 6 | 6 | | | | | Q | Z Diyas | 4 | 6 | 6 | | | | | |
| | M Doi | 6 | 1 | 1 | Q | Z Diyas | 6 | 6 | | | | | | | | | | |
| | R Hogenkamp | 3 | 3 | | 2 | S Zhang | 4 | 2 | | | | | | | | | | |
| 2 | S Zhang | 6 | 6 | | | | | | | | | | | | | | | |

## Qualifying
### 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

### Qualifying draw
#### First qualifier

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 1 | Danka Kovinić | 3 | 6 | 6 | | | | | | | | | | |
| | Jennifer Elie | 6 | 4 | 3 | | | | | | | | | | |
| | Jennifer Elie | 6 | 4 | 3 | 1 | Danka Kovinić | 2 | 6 | 6 | | | | | |
| | | | | | Alt | Erika Sema | 6 | 3 | 2 | | | | | |
| WC | Moyuka Uchijima | 6 | 4 | 2 | Alt | Erika Sema | 6 | 3 | 2 | | | | | |
| Alt | Erika Sema | 3 | 6 | 6 | | | | | | | | | | |
| Alt | Erika Sema | 3 | 6 | 6 | | | | | | 1 | Danka Kovinić | 6 | 3 | 6 |
| | | | | | | | | | | | Miharu Imanishi | 3 | 6 | 2 |
| | İpek Soylu | 2 | 1 | | | | | | | | | | | | Miharu Imanishi | 3 | 6 | 2 |
| | Miharu Imanishi | 6 | 6 | | | | | | | | | | | |
| | Miharu Imanishi | 6 | 6 | | | Miharu Imanishi | 2 | 6 | 6 | | | | | |
| | | | | | | Lizette Cabrera | 6 | 4 | 0 | | | | | |
| | Lizette Cabrera | 6 | 4 | 6 | | Lizette Cabrera | 6 | 4 | 0 | | | | | |
| 7 | Arantxa Rus | 2 | 6 | 3 | | | | | | | | | | |

#### Second qualifier

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 2 | Zarina Diyas | 6 | 6 | | | | | | | | | | |
| | Danielle Collins | 3 | 2 | | | | | | | | | | |
| | Danielle Collins | 3 | 2 | | 2 | Zarina Diyas | 6 | 6 | | | | | |
| | | | | | | Giulia Gatto-Monticone | 3 | 2 | | | | | |
| | Ayano Shimizu | 2 | 4 | | | Giulia Gatto-Monticone | 3 | 2 | | | | | |
| | Giulia Gatto-Monticone | 6 | 6 | | | | | | | | | | |
| | Giulia Gatto-Monticone | 6 | 6 | | | | | | 2 | Zarina Diyas | 1 | 7$^7$ | 6 |
| | | | | | | | | | | Luksika Kumkhum | 6 | 6$^4$ | 4 |
| | Mayo Hibi | 2 | 6 | 4 | | | | | | | | | | Luksika Kumkhum | 6 | 6$^4$ | 4 |
| | Luksika Kumkhum | 6 | 3 | 6 | | | | | | | | | |
| | Luksika Kumkhum | 6 | 3 | 6 | | Luksika Kumkhum | 6 | 6 | | | | | |
| | | | | | 6 | Jang Su-jeong | 4 | 4 | | | | | |
| WC | Himari Sato | 1 | 2 | | 6 | Jang Su-jeong | 4 | 4 | | | | | |
| 6 | Jang Su-jeong | 6 | 6 | | | | | | | | | | |

#### Third qualifier

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 3 | Kristie Ahn | 6$^1$ | 6 | 4 | | | | | | | | | |
| | Miyu Kato | 7$^7$ | 4 | 6 | | | | | | | | | |
| | Miyu Kato | 7$^7$ | 4 | 6 | | Miyu Kato | 6 | 6 | | | | | |
| | | | | | | Başak Eraydın | 3 | 0 | | | | | |
| | Başak Eraydın | 4 | 7$^7$ | 6 | | Başak Eraydın | 3 | 0 | | | | | |
| | Riko Sawayanagi | 6 | 6$^4$ | 3 | | | | | | | | | |
| | Riko Sawayanagi | 6 | 6$^4$ | 3 | | | | | | Miyu Kato | 6 | 2 | 7$^7$ |
| | | | | | | | | | | Magdalena Fręch | 3 | 6 | 6$^3$ |
| | Rebecca Peterson | 6 | 5 | 2 | | | | | | | | | | Magdalena Fręch | 3 | 6 | 6$^3$ |
| | Magdalena Fręch | 3 | 7 | 6 | | | | | | | | | |
| | Magdalena Fręch | 3 | 7 | 6 | | Magdalena Fręch | 4 | 7$^7$ | 6 | | | | |
| | | | | | 5 | Arina Rodionova | 6 | 6$^3$ | 1 | | | | |
| WC | Mari Osaka | 6 | 4 | 4 | 5 | Arina Rodionova | 6 | 6$^3$ | 1 | | | | |
| 5 | Arina Rodionova | 4 | 6 | 6 | | | | | | | | | |

#### Fourth qualifier

| First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 4 | Jana Fett | 6 | 6 | | | | | | | | | |
| | Eri Hozumi | 2 | 2 | | | | | | | | | |
| | Eri Hozumi | 2 | 2 | 4 | Jana Fett | 6 | 4 | 6 | | | | |
| | | | | | Karolína Muchová | 1 | 6 | 4 | | | | |
| | Hiroko Kuwata | 4 | 2 | | Karolína Muchová | 1 | 6 | 4 | | | | |
| | Karolína Muchová | 6 | 6 | | | | | | | | | |
| | Karolína Muchová | 6 | 6 | | | | | | 4 | Jana Fett | 6 | 6 |
| | | | | | | | | | | Lesley Kerkhove | 4 | 0 |
| | Junri Namigata | 2 | 1 | | | | | | | | | | Lesley Kerkhove | 4 | 0 |
| | Lesley Kerkhove | 6 | 6 | | | | | | | | | |
| | Lesley Kerkhove | 6 | 6 | | Lesley Kerkhove | 6 | 7 | | | | | |
| | | | | 8 | Quirine Lemoine | 3 | 5 | | | | | |
| | Peangtarn Plipuech | 1 | 5 | 8 | Quirine Lemoine | 3 | 5 | | | | | |
| 8 | Quirine Lemoine | 6 | 7 | | | | | | | | | |