| Kōfu International Open | |
| Type: | joint |
| Event Name: | Kōfu International Open |
| Location: | Kōfu, Japan |
| Venue: | Yamanashi Gakuin Yokone Tennis Center |
| Surface: | Hard |
| Website: | kofuopen.estclub.co.jp |
| Atp Category: | ITF Men's Circuit |
| Atp Draw: | 32S / 32Q / 16D |
| Atp Prize Money: | $15,000 |
| Wta Tier: | ITF Women's Circuit |
| Wta Draw: | 32S / 32Q / 16D |
| Wta Prize Money: | $40,000 |
The Kōfu International Open is a tournament for professional female tennis players on outdoor hardcourts. The event is classified as a $40,000 ITF Women's Circuit. It had been held in Kōfu, Japan, since 2003. In 2011, it was a $50k women's event.
| Year | Champion | Runner-up | Score | |
|---|---|---|---|---|
| 2024 |  Catherine Harrison | 6–7(8–10), 6–1, 6–1 | ||
| 2023 |  Jang Su-jeong | 2–6, 6–3, 6–2 | ||
| 2020–22 | ||||
| 2019 | Lee Hua-chen | 6–7(4–7), 6–3, 6–4 | ||
| 2018 |  Luksika Kumkhum | 6–3, 6–3 | ||
| 2017 |  Mayo Hibi | 5–7, 6–3, 6–2 | ||
| 2016 |  Susanne Celik | 7–6(7–3), 6–3 | ||
| 2015 | Miki Miyamura | 6–4, 6–2 | ||
| 2014 | Chiaki Okadaue | 3–6, 7–6(9–7), 6–2 | ||
| 2013 | Yuuki Tanaka | 6–3, 6–1 | ||
| 2012 | Hiroko Kuwata | 6–4, 4–6, 7–6(9–7) | ||
| Chang Kai-chen | 6–4, 1–6, 6–4 | |||
| 2010 | Sachie Ishizu | 1–6, 6–1, 6–0 | ||
| 2009 | Misaki Doi | 7–5, 6–2 |
| Year | Champions | Runners-up | Score | |
|---|---|---|---|---|
| 2024 | Erina Hayashi Saki Imamura | 6–3, 7–5 | ||
| 2023 | Han Na-lae Jang Su-jeong | 6–0, 6–4 | ||
| 2020–22 | ||||
| 2019 | Chang Kai-chen Hsu Ching-wen | 6–1, 6–3 | ||
| 2018 |  Gao Xinyu Luksika Kumkhum | 6–0, 2–6, [10–4] | ||
| 2017 | Han Na-lae Luksika Kumkhum | 6–3, 6–0 | ||
| 2016 | Shuko Aoyama Erina Hayashi | 7–5, 7–5 | ||
| 2015 | Haruka Kaji Aiko Yoshitomi | 6–2, 6–3 | ||
| 2014 | Nagi Hanatani Hikari Yamamoto | 3–6, 6–2, [10–7] | ||
| 2013 | Akari Inoue Hiroko Kuwata | 3–6, 7–5, [10–7] | ||
| 2012 | Ayumi Oka Kotomi Takahata | 6–4, 5–7, [10–3] | ||
| Chan Chin-wei Hsu Wen-hsin | 6–3, 6–4 | |||
| 2010 | Maki Arai Seiko Okamoto | 6–4, 6–4 | ||
| 2009 | Shuko Aoyama Akari Inoue | 7–5, 3–6, [10–8] |
| Year | Champion | Runner-up | Score | |
|---|---|---|---|---|
| 2020 | ||||
| 2019 | Jumpei Yamasaki | 7–6(7–5), 6–3 | ||
| 2018 | Hong Seong-chan | 7–6(7–2), 6–1 | ||
| 2017 | Takuto Niki | 6–4, 4–0 ret. | ||
| 2016 | Lee Duck-hee | 6–2, 6–3 | ||
| 2015 | Lim Yong-kyu | 7–6(8–6), 6–3 | ||
| 2014 | Takuto Niki | 6–4, 6–2 | ||
| 2013 | Chang Yu | 6–2, 6–1 | ||
| 2012 | Hiroki Moriya | 6–1, 6–4 | ||
| 2011 | Not held | |||
| 2010 | Go Soeda | 6–3, 6–4 | ||
| 2009 | An Jae-sung | 5–7, 6–4, 7–6(7–5) | ||
| 2008 | Yaoki Ishii | 6–7(2–7), 6–3, 6–4 | ||
| 2007 | Kwon Hyung-tae | 7–5, 6–1 | ||
| 2006 | Jun Woong-sun | 7–6(7–4), 7–5 | ||
| 2005 | Satoshi Iwabuchi | 6–2, 7–6(8–6) | ||
| 2004 | Michihisa Onoda | 6–3, 7–5 | ||
| 2003 | Takahiro Terachi | 6–2, 6–2 |
| Year | Champions | Runners-up | Score | |
|---|---|---|---|---|
| 2020 | ||||
| 2019 | Hiroyasu Ehara Sho Katayama | 6–2, 6–4 | ||
| 2018 | Hiroyasu Ehara Sho Katayama | 7–5, 7–6(7–5) | ||
| 2017 | Katsuki Nagao Hiromasa Oku | 6–4, 6–7(4–7), [10–3] | ||
| 2016 | Shintaro Imai Takuto Niki | 6–1, 6–2 | ||
| 2015 | Gao Xin Li Zhe | 6–0, 6–7(4–7), [10–1] | ||
| 2014 | Takuto Niki Arata Onozawa | 6–4, 6–2 | ||
| 2013 | Hiroki Kondo Kento Takeuchi | 6–1, 3–6, [10–7] | ||
| 2012 | Peng Hsien-yin Bumpei Sato | 6–3, 5–7, [10–6] | ||
| 2011 | Not held | |||
| 2010 | Tasuku Iwami Hiroki Kondo | 6–2, 6–3 | ||
| 2009 | Yang Tsung-hua Yi Chu-huan | 6–1, 6–0 | ||
| 2008 | Gong Maoxin Li Zhe | 6–1, 7–5 | ||
| 2007 | Akito Higa Tomohiro Shinokawa | 3–6, 6–4, 6–4 | ||
| 2006 | Jun Woong-sun Kim Sun-yong | 6–2, 7–6(7–4) | ||
| 2005 | Im Kyu-tae Kwon Oh-hee |  Mark Nielsen Hiroyasu Sato | 4–6, 7–6(7–3), 6–3 | |
| 2004 | Scott Lipsky David Martin | 2–6, 7–5, 7–6(8–6) | ||
| 2003 | Robert Cheyne Mark Nielsen | 4–6, 6–4, 6–3 |