# Keio Challenger

The Keio Challenger is a professional tennis tournament played on hardcourts. It is currently part of the ATP Challenger Tour and the ITF Women's Circuit. Having been held in Yokohama, Japan since 1999, the women's edition of the event was introduced in 2017.

## Past finals
### Men's singles

| Year | Champion | Runner-up | Score |
| 2024 | Yuta Shimizu | Li Tu | 6–7$^{(4–7)}$, 6–4, 6–2 |
| 2023 | Yosuke Watanuki | Yuta Shimizu | 7–6$^{(7–5)}$, 6–4 |
| 2022 | Christopher O'Connell | Yosuke Watanuki | 6–1, 6–7$^{(5–7)}$, 6–3 |
| 2020–21 | Not held | Not held | Not held |
| 2019 | Kwon Soon-woo | Oscar Otte | 7–6$^{(7–4)}$, 6–3 |
| 2018 | Yasutaka Uchiyama | Tatsuma Ito | 2–6, 6–3, 6–4 |
| 2017 | Yūichi Sugita | Kwon Soon-woo | 6–4, 2–6, 7–6$^{(7–2)}$ |
| 2016 | Not held | Not held | Not held |
| 2015 | Taro Daniel | Go Soeda | 4–6, 6–3, 6–3 |
| 2014 | John Millman | Kyle Edmund | 6–4, 6–4 |
| 2013 | Matthew Ebden | Go Soeda | 2–6, 7–6$^{(7–3)}$, 6–3 |
| 2012 | Matteo Viola | Mirza Bašić | 7–6$^{(7–3)}$, 6–3 |
| 2010–11 | Not held | Not held | Not held |
| 2009 | Takao Suzuki | Martin Fischer | 6–4, 7–6$^{(7−5)}$ |
| 2008 | Lee Hyung-taik | Go Soeda | 7–5, 6–3 |
| 2007 | Dudi Sela | Takao Suzuki | 6–7$^{(5−7)}$, 6–4, 6–2 |
| 2003–06 | Not held | Not held | Not held |
| 2002 | Lee Hyung-taik | John van Lottum | 2–6, 7–6$^{(7−2)}$, 7–6$^{(8−6)}$ |
| 2001 | Takao Suzuki | Gouichi Motomura | 6–2, 6–7$^{(5−7)}$, 7–6$^{(7−4)}$ |
| 2000 | Eric Taino | Julian Knowle | 7–6$^{(7−5)}$, 6–4 |
| 1999 | Lee Hyung-taik | Paradorn Srichaphan | 6–3, 6–0 |

### Men's doubles

| Year | Champions | Runners-up | Score |
| 2024 | Benjamin Hassan Saketh Myneni | Blake Bayldon Calum Puttergill | 6–2, 6–4 |
| 2023 | Filip Bergevi Mick Veldheer | Ray Ho Calum Puttergill | 2–6, 7–5, [11–9] |
| 2022 | Victor Vlad Cornea Ruben Gonzales | Tomoya Fujiwara Masamichi Imamura | 7–5, 6–3 |
| 2020–21 | Not held | Not held | Not held |
| 2019 | Moez Echargui Skander Mansouri | Max Purcell Luke Saville | 7–6$^{(8–6)}$, 6–7$^{(3–7)}$, [10–7] |
| 2018 | Tobias Kamke Tim Pütz | Sanchai Ratiwatana Sonchat Ratiwatana | 3–6, 7–5, [12–10] |
| 2017 | Marin Draganja Tomislav Draganja | Joris De Loore Luke Saville | 4–6, 6–3, [10–4] |
| 2016 | Not held | Not held | Not held |
| 2015 | Sanchai Ratiwatana Sonchat Ratiwatana | Riccardo Ghedin Yi Chu-huan | 6–4, 6–4 |
| 2014 | Bradley Klahn Matt Reid | Marcus Daniell Artem Sitak | 4–6, 6–4, [10–7] |
| 2013 | Bradley Klahn Michael Venus | Sanchai Ratiwatana Sonchat Ratiwatana | 7–5, 6–1 |
| 2012 | Prakash Amritraj Philipp Oswald | Sanchai Ratiwatana Sonchat Ratiwatana | 6–3, 6–4 |
| 2010–11 | Not Held | Not Held | Not Held |
| 2009 | Yang Tsung-hua Yi Chu-huan | Alexey Kedryuk Junn Mitsuhashi | 6–7$^{(9−11)}$, 6–3, [12–10] |
| 2008 | Tomáš Cakl Marek Semjan | Brendan Evans Martin Slanar | 6–3, 7–6$^{(7−1)}$ |
| 2007 | Hiroki Kondo Go Soeda | Satoshi Iwabuchi Toshihide Matsui | 6–7$^{(5−7)}$, 6–3, [11–9] |
| 2003–06 | Not held | Not held | Not held |
| 2002 | Lu Yen-hsun Danai Udomchoke | Ivo Karlović Mark Nielsen | 7–6$^{(7−5)}$, 6–3 |
| 2001 | Takao Suzuki Mitsuru Takada | Marco Chiudinelli Sebastian Jäger | 6–3, 6–4 |
| 2000 | Yves Allegro Julian Knowle | Tim Crichton Ashley Fisher | 6–3, 7–6$^{(7−2)}$ |
| 1999 | Satoshi Iwabuchi Thomas Shimada | Michael Joyce Kyle Spencer | 6–2, 6–4 |

### Women's singles

| Year | Champion | Runner-up | Score |
| 2024 | Aliona Falei | Hina Inoue | 3–6, 6–1, 6–4 |
| 2023 | Aliona Falei | Ayano Shimizu | 6–3, 7–5 |
| 2022 | Han Na-lae | Miyu Kato | 7–5, 6–0 |
| 2021 | Not held | Not held | Not held |
| 2020 | Yuriko Miyazaki | Mai Hontama | 7–5, 5–7, 6–2 |
| 2019 | Greet Minnen | Elena-Gabriela Ruse | 6–4, 6–1 |
| 2018 | Veronika Kudermetova | Harriet Dart | 6–2, 6–4 |
| 2017 | Akiko Omae | Mayo Hibi | 7–5, 6–2 |

### Women's doubles

| Year | Champions | Runners-up | Score |
| 2024 | Momoko Kobori Ayano Shimizu | Cho I-hsuan Cho Yi-tsen | 6–4, 7–6$^{(7–2)}$ |
| 2023 | Liang En-shuo Tang Qianhui | Aoi Ito Natsumi Kawaguchi | Walkover |
| 2022 | Saki Imamura Naho Sato | Han Na-lae Mai Hontama | 6–4, 4–6, [10–5] |
| 2021 | Not held | Not held | Not held |
| 2020 | Robu Kajitani Naho Sato | Erina Hayashi Kanako Morisaki | 1–6, 6–4, [10–8] |
| 2019 | Choi Ji-hee Han Na-lae | Rutuja Bhosale Akiko Omae | 6–1, 7–5 |
| 2018 | Laura Robson Fanny Stollár | Momoko Kobori Chihiro Muramatsu | 5–7, 6–2, [10–4] |
| 2017 | Ayaka Okuno Erika Sema | Kanako Morisaki Minori Yonehara | 6–4, 6–4 |