| 2017 Keio Challenger | |
|---|---|
| Date | 27 February – 5 March (ATP) 6 – 12 March (ITF) | 
| Edition | 12th (ATP) 1st (ITF) | 
| Category | ATP Challenger Tour ITF Women's Circuit | 
| Prize money | $50,000+H (ATP) $25,000 (ITF) | 
| Surface | Hard | 
| Location | Yokohama, Japan | 
| Champions | |
| Men's singles | |
|  Yūichi Sugita | |
| Women's singles | |
|  Akiko Omae | |
| Men's doubles | |
|  Marin Draganja /  Tomislav Draganja | |
| Women's doubles | |
|  Ayaka Okuno /  Erika Sema | |
The 2017 Keio Challenger was a professional tennis tournament played on hard courts. It was the twelfth (ATP) and first (ITF) editions of the tournament and part of the 2017 ATP Challenger Tour and the 2017 ITF Women's Circuit. The tournament offered $50,000+H in prize money for the men and $25,000 prize money for the women. It took place in Yokohama, Japan between 27 February and 5 March 2017 for the men's edition and between 6 and 12 March 2017 for the women's.
Men's singles main-draw entrants
Seeds
| Country | Player | Rank1 | Seed | 
|---|---|---|---|
|  JPN | Yūichi Sugita | 114 | 1 | 
| .svg.png.webp) SUI | Henri Laaksonen | 122 | 2 | 
|  KOR | Lee Duck-hee | 135 | 3 | 
|  JPN | Go Soeda | 136 | 4 | 
|  SLO | Grega Žemlja | 150 | 5 | 
| .svg.png.webp) BEL | Ruben Bemelmans | 152 | 6 | 
|  CHN | Zhang Ze | 157 | 7 | 
| .svg.png.webp) AUS | Andrew Whittington | 164 | 8 | 
- 1 Rankings are as of February 20, 2017.
Other entrants
The following players received wildcards into the singles main draw:
 Sora Fukuda Sora Fukuda
 Masato Shiga Masato Shiga
 Kaito Uesugi Kaito Uesugi
 Yosuke Watanuki Yosuke Watanuki
The following player received entry into the singles main using a protected ranking:
The following player received entry into the singles main draw as a special exemption:
The following players received entry from the qualifying draw:
Women's singles main-draw entrants
Seeds
| Country | Player | Rank1 | Seed | 
|---|---|---|---|
|  JPN | Miyu Kato | 201 | 1 | 
|  GBR | Laura Robson | 207 | 2 | 
|  JPN | Akiko Omae | 229 | 3 | 
|  JPN | Mayo Hibi | 230 | 4 | 
|  JPN | Shiho Akita | 246 | 5 | 
|  JPN | Junri Namigata | 256 | 6 | 
|  KAZ | Galina Voskoboeva | 257 | 7 | 
|  JPN | Kyōka Okamura | 259 | 8 | 
- 1 Rankings are as of February 27, 2017.
Other entrants
The following players received wildcards into the singles main draw:
 Sumina Eshiro Sumina Eshiro
 Hayaka Murase Hayaka Murase
 Megumi Nishimoto Megumi Nishimoto
 Suzuho Oshino Suzuho Oshino
The following players received entry from the qualifying draw:
 Haruna Arakawa Haruna Arakawa
 Erina Hayashi Erina Hayashi
 Miyabi Inoue Miyabi Inoue
 Haruka Kaji Haruka Kaji
 Rio Kitagawa Rio Kitagawa
 Mai Minokoshi Mai Minokoshi
 Ramu Ueda Ramu Ueda
 Aki Yamasoto Aki Yamasoto
Champions
Men's singles
 Yūichi Sugita def. Yūichi Sugita def. Kwon Soon-woo 6–4, 2–6, 7–6(7–2). Kwon Soon-woo 6–4, 2–6, 7–6(7–2).
Women's singles
 Akiko Omae def. Akiko Omae def. Mayo Hibi 7–5, 6–2. Mayo Hibi 7–5, 6–2.
Men's doubles
 Marin Draganja / Marin Draganja / Tomislav Draganja def. Tomislav Draganja def..svg.png.webp) Joris De Loore / Joris De Loore /.svg.png.webp) Luke Saville 4–6, 6–3, [10–4]. Luke Saville 4–6, 6–3, [10–4].
Women's doubles
 Ayaka Okuno / Ayaka Okuno / Erika Sema def. Erika Sema def. Kanako Morisaki / Kanako Morisaki / Minori Yonehara, 6–4, 6–4. Minori Yonehara, 6–4, 6–4.
External links
- Official Website
- 2017 Keio Challenger at ITFtennis.com

