| Kinoshita Group Japan Open | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| WTA Tour | |||||||||
| Founded | 2009 | ||||||||
| Editions | 14 (2025) | ||||||||
| Location | Osaka(2009–2014, 2023-) Tokyo(2015–2017) Hiroshima(2018–2019) Japan | ||||||||
| Venue | Utsubo Tennis Center(2009-2014, 2023-) Ariake Tennis Forest Park(2015-2017) Regional Park Tennis Stadium(2018-2019) | ||||||||
| Surface | Hard / outdoors | ||||||||
| Website | japanopentennis.com | ||||||||
| Current champions (2025) | |||||||||
| Singles |  Leylah Fernandez | ||||||||
| Doubles |  Kristina Mladenovic Taylor Townsend | ||||||||
| |||||||||
TheJapan Women's Open, currently sponsored by the Kinoshita Group (formerlyJapan Women's Open Tennis), is a professional women'stennis tournament played annually onoutdoor hardcourts in Osaka, Japan. The event is affiliated with theWomen's Tennis Association (WTA), and is anWTA 250 tournament on theWTA Tour.[1] As successor to theJapan Open (where men and women played simultaneously, up to 2008) the event was held in women-only form for the first time in2009, and was the second tournament of the season held in Japan: thePan Pacific Open, aPremier 5 tournament, was held two weeks before. In 2015, the event was moved fromOsaka toTokyo and in 2018 toHiroshima, before returning to Osaka in 2023 after a three year hiatus.
| Location | Year | Champion | Runner-up | Score |
|---|---|---|---|---|
| Osaka | 2025 | Leylah Fernandez |  Tereza Valentová | 6–0, 5–7, 6–3 |
| 2024 |  Suzan Lamens |  Kimberly Birrell | 6–3, 6–3 | |
| 2023 | Ashlyn Krueger |  Zhu Lin | 6–3, 7–6(8–6) | |
| 2022 | no competition (due to financial crisis)[citation needed] | |||
| 2021 | no competition (due toCOVID-19 pandemic)[2][3] | |||
| 2020 | ||||
| Hiroshima | 2019 |  Nao Hibino | Misaki Doi | 6–3, 6–2 |
| 2018 |  Hsieh Su-wei | Amanda Anisimova | 6–2, 6–2 | |
| Tokyo | 2017 |  Zarina Diyas | Miyu Kato | 6–2, 7–5 |
| 2016 | Christina McHale | Kateřina Siniaková | 3–6, 6–4, 6–4 | |
| 2015 |  Yanina Wickmayer |  Magda Linette | 4–6, 6–3, 6–3 | |
| Osaka | 2014 | Samantha Stosur (3) | Zarina Diyas | 7–6(9–7), 6–3 |
| 2013 | Samantha Stosur (2) | Eugenie Bouchard | 3–6, 7–5, 6–2 | |
| 2012 |  Heather Watson | Chang Kai-chen | 7–5, 5–7, 7–6(7–4) | |
| 2011 | Marion Bartoli | Samantha Stosur | 6–3, 6–1 | |
| 2010 |  Tamarine Tanasugarn | Kimiko Date-Krumm | 7–5, 6–7(7–4), 6–1 | |
| 2009 | Samantha Stosur |  Francesca Schiavone | 7–5, 6–1 | |
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