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| Singles | |
|---|---|
| 2015 Japan Women's Open | |
| Champion |  Yanina Wickmayer |
| Runner-up |  Magda Linette |
| Score | 4–6, 6–3, 6–3 |
Samantha Stosur was the defending champion, but chose not to participate.
Yanina Wickmayer won the title, defeating Magda Linette in the final 4–6, 6–3, 6–3. [1]
Carla Suárez Navarro (first round)
Zarina Diyas (second round)
Madison Brengle (quarterfinals) Alison Riske (first round)
Johanna Larsson (second round) Christina McHale (semifinals)
Ajla Tomljanović (semifinals)
Polona Hercog (first round)| Semifinals | Final | ||||||||||||
| Yanina Wickmayer | 7 | 6 | |||||||||||
| 7 | Ajla Tomljanović | 5 | 2 | ||||||||||
| Yanina Wickmayer | 4 | 6 | 6 | ||||||||||
| Magda Linette | 6 | 3 | 3 | ||||||||||
| 6 | Christina McHale | 6 | 4 | 3 | |||||||||
| Magda Linette | 3 | 6 | 6 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1/WC | C Suárez Navarro | 4 | 4 | ||||||||||||||||||||||||
 K Bondarenko | 6 | 6 | K Bondarenko | 6 | 3 | 6 | |||||||||||||||||||||
 J Gajdošová | 6 | 6 | J Gajdošová | 1 | 6 | 4 | |||||||||||||||||||||
| Q |  A Panova | 3 | 4 | K Bondarenko | 6 | 3 | 4 | ||||||||||||||||||||
 K Siniaková | 4 | 3 | Y Wickmayer | 3 | 6 | 6 | |||||||||||||||||||||
| Y Wickmayer | 6 | 6 | Y Wickmayer | 7 | 6 | ||||||||||||||||||||||
 Q Wang | 6 | 3 | 3 | 5 | J Larsson | 5 | 3 | ||||||||||||||||||||
| 5 | J Larsson | 0 | 6 | 6 | Y Wickmayer | 7 | 6 | ||||||||||||||||||||
| 3 | M Brengle | 6 | 6 | 7 | A Tomljanović | 5 | 2 | ||||||||||||||||||||
 A-L Friedsam | 3 | 1 | 3 | M Brengle | 6 | 6 | |||||||||||||||||||||
| WC |  N Hibino | 3 | 6 | 6 | WC | N Hibino | 1 | 2 | |||||||||||||||||||
| Q | H Kuwata | 6 | 4 | 4 | 3 | M Brengle | 6 | 3 | 4 | ||||||||||||||||||
| WC | K Date-Krumm | 6 | 6 | 7 | A Tomljanović | 1 | 6 | 6 | |||||||||||||||||||
| M Doi | 4 | 2 | WC | K Date-Krumm | 65 | 3 | |||||||||||||||||||||
 T Babos | 6 | 4 | 62 | 7 | A Tomljanović | 77 | 6 | ||||||||||||||||||||
| 7 | A Tomljanović | 3 | 6 | 77 | |||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | C McHale | 6 | 7 | ||||||||||||||||||||||||
| Y Putintseva | 3 | 5 | 6 | C McHale | 6 | 7 | |||||||||||||||||||||
 B Jovanovski | 1 | 1 | Q | R Ozaki | 1 | 5 | |||||||||||||||||||||
| Q | R Ozaki | 6 | 6 | 6 | C McHale | 2 | 6 | 6 | |||||||||||||||||||
| Q | N Osaka | 7 | 5 | 3 | S Zheng | 6 | 3 | 3 | |||||||||||||||||||
| I Falconi | 5 | 7 | 6 | I Falconi | 4 | 2 | |||||||||||||||||||||
| S Zheng | 0 | 6 | 6 | S Zheng | 6 | 6 | |||||||||||||||||||||
| 4 | A Riske | 6 | 4 | 1 | 6 | C McHale | 6 | 4 | 3 | ||||||||||||||||||
| 8 | P Hercog | 1 | 7 | 5 | M Linette | 3 | 6 | 6 | |||||||||||||||||||
 S-w Hsieh | 6 | 5 | 7 | S-w Hsieh | 6 | 6 | |||||||||||||||||||||
 A Mitu | 1 | 4 | K Nara | 2 | 4 | ||||||||||||||||||||||
| K Nara | 6 | 6 | S-w Hsieh | 3 | 3 | ||||||||||||||||||||||
| M Linette | 6 | 6 | M Linette | 6 | 6 | ||||||||||||||||||||||
| L Davis | 3 | 2 | M Linette | 6 | 7 | ||||||||||||||||||||||
 K Bertens | 4 | 4 | 2 | Z Diyas | 2 | 5 | |||||||||||||||||||||
| 2 | Z Diyas | 6 | 6 | ||||||||||||||||||||||||
Kristýna Plíšková (second round) Patricia Maria Țig (qualifying competition) María Teresa Torró Flor (qualifying competition; retired) Wang Yafan (second round) Alexandra Panova (qualified)
Stefanie Vögele (first round) Risa Ozaki (qualified) Petra Martić (withdrew, still playing in Dalian)| First round | Second round | Qualifying competition | ||||||||||||||||||
| 1 | Kristýna Plíšková | 6 | 7 | |||||||||||||||||
| Eri Hozumi | 4 | 5 | ||||||||||||||||||
| 1 | Kristýna Plíšková | 2 | 3 | |||||||||||||||||
| Shuko Aoyama | 6 | 6 | ||||||||||||||||||
| Shuko Aoyama | 6 | 7 | ||||||||||||||||||
| WC | Chihiro Muramatsu | 0 | 5 | |||||||||||||||||
| Shuko Aoyama | 4 | 6 | 66 | |||||||||||||||||
| Hiroko Kuwata | 6 | 4 | 78 | |||||||||||||||||
| Alt | Olga Savchuk | 6 | 6 | |||||||||||||||||
| Sara Sorribes Tormo | 2 | 2 | ||||||||||||||||||
| Alt | Olga Savchuk | 2 | 1 | |||||||||||||||||
| Hiroko Kuwata | 6 | 6 | ||||||||||||||||||
| Hiroko Kuwata | 5 | 6 | 6 | |||||||||||||||||
| 6 | Stefanie Vögele | 7 | 0 | 4 | ||||||||||||||||
| First round | Second round | Qualifying competition | ||||||||||||||||||
| 2 | Patricia Maria Țig | 6 | 77 | |||||||||||||||||
| Paula Badosa Gibert | 3 | 65 | ||||||||||||||||||
| 2 | Patricia Maria Țig | 6 | 6 | |||||||||||||||||
| WC | Miyabi Inoue | 1 | 3 | |||||||||||||||||
| WC | Miyabi Inoue | 77 | 0 | 6 | ||||||||||||||||
 Han Na-lae | 65 | 6 | 2 | |||||||||||||||||
| 2 | Patricia Maria Țig | 4 | 3 | |||||||||||||||||
| 5 | Alexandra Panova | 6 | 6 | |||||||||||||||||
| Alt | Jang Su-jeong | 62 | 0 | |||||||||||||||||
| WC | Makoto Ninomiya | 77 | 6 | |||||||||||||||||
| WC | Makoto Ninomiya | 1 | 3 | |||||||||||||||||
| 5 | Alexandra Panova | 6 | 6 | |||||||||||||||||
| Katarzyna Piter | 65 | 65 | ||||||||||||||||||
| 5 | Alexandra Panova | 77 | 77 | |||||||||||||||||
| First round | Second round | Qualifying competition | ||||||||||||||||||
| 3 | María Teresa Torró Flor | 6 | 6 | |||||||||||||||||
| Sorana Cîrstea | 3 | 4 | ||||||||||||||||||
| 3 | María Teresa Torró Flor | 6 | 6 | |||||||||||||||||
| WC | Erika Sema | 2 | 0 | |||||||||||||||||
 Gabriela Dabrowski | 78 | 2 | 4 | |||||||||||||||||
| WC | Erika Sema | 66 | 6 | 6 | ||||||||||||||||
| 3 | María Teresa Torró Flor | 0r | ||||||||||||||||||
| 7 | Risa Ozaki | 2 | ||||||||||||||||||
| Yang Zhaoxuan | 6 | 2 | 6 | |||||||||||||||||
| Riko Sawayanagi | 2 | 6 | 3 | |||||||||||||||||
| Yang Zhaoxuan | 63 | 2 | ||||||||||||||||||
| 7 | Risa Ozaki | 77 | 6 | |||||||||||||||||
| Tereza Martincová | 4 | 4 | ||||||||||||||||||
| 7 | Risa Ozaki | 6 | 6 | |||||||||||||||||
| First round | Second round | Qualifying competition | ||||||||||||||||||
| 4 | Wang Yafan | 6 | 6 | |||||||||||||||||
| Miyu Kato | 0 | 1 | ||||||||||||||||||
| 4 | Wang Yafan | 3 | 1 | |||||||||||||||||
| Naomi Osaka | 6 | 6 | ||||||||||||||||||
| Junri Namigata | 4 | 3 | ||||||||||||||||||
| Naomi Osaka | 6 | 6 | ||||||||||||||||||
| Naomi Osaka | 78 | 6 | ||||||||||||||||||
 Luksika Kumkhum | 66 | 1 | ||||||||||||||||||
| Luksika Kumkhum | 4 | 7 | 6 | |||||||||||||||||
| Misa Eguchi | 6 | 5 | 4 | |||||||||||||||||
| Luksika Kumkhum | 79 | 3 | 6 | |||||||||||||||||
| Xu Yifan | 67 | 6 | 3 | |||||||||||||||||
| Xu Yifan | 6 | 6 | ||||||||||||||||||
| Alt |  Ankita Raina | 0 | 3 | |||||||||||||||||
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