| 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 | ||||||||
| 
 | |||||||||
The Japan Women's Open, currently sponsored by the Kinoshita Group (formerly Japan Women's Open Tennis), is a professional women's tennis tournament played annually on outdoor hardcourts in Osaka, Japan. The event is affiliated with the Women's Tennis Association (WTA), and is an WTA 250 tournament on the WTA Tour. [1] As successor to the Japan Open (where men and women played simultaneously, up to 2008) the event was held in women-only form for the first time in 2009, and was the second tournament of the season held in Japan: the Pan Pacific Open, a Premier 5 tournament, was held two weeks before. In 2015, the event was moved from Osaka to Tokyo and in 2018 to Hiroshima, 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 to COVID-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 | |