Round: 25 Ground: Hardcourt outdoor
| ITF Women Nishi-Tama | 2017/03/22 05:55 | Ayumi Koshiishi v Risa Ushijima | 1-6,1-6 |
| ITF Women Hong Kong | 2017/12/27 04:05 | Hiroko Kuwata v Risa Ushijima | 6-0,6-3 |
| ITF Women Hong Kong | 2017/12/26 02:00 | Risa Ushijima v Mi Zhuoma You | 6-3,4-6,7-6 |
| ITF Women Tokyo Qual | 2017/11/04 04:20 | Haruna Arakawa v Risa Ushijima | 6-4,6-4 |
| ITF Women Hua Hin | 2017/07/24 04:00 | Stefanie Tan v Risa Ushijima | 5-7,6-3,6-4 |
| ITF Women Hua Hin | 2017/07/20 03:15 | Bunyawi Thamchaiwat v Risa Ushijima | 6-1,7-5 |
| ITF Women Hua Hin | 2017/07/19 03:00 | Michika Ozeki v Risa Ushijima | 1-6,6-7 |
| ITF Women Hua Hin | 2017/07/18 06:30 | Ksenia Laskutova v Risa Ushijima | 2-6,2-6 |
| ITF Women Hua Hin | 2017/07/12 06:00 | Risa Ushijima v Alexandra Bozovic | 4-6,6-4,5-7 |
| ITF Women Hong Kong | 2017/12/31 02:00 | Ayumi Koshiishi v Pinyi Zuo | 6-1,6-0 |
| ITF Women Hong Kong | 2017/12/30 05:30 | Ayumi Koshiishi v Ashmitha Easwaramurthi | 6-0,6-2 |
| ITF Women Hong Kong | 2017/12/27 03:30 | Ayumi Koshiishi v Ling Zhang | 4-6,3-6 |
| ITF Women Hong Kong | 2017/12/25 04:45 | Ayumi Koshiishi v Yuqi Sheng | 7-6,6-2 |
| ITF Women Hong Kong | 2017/12/24 02:00 | Ayumi Koshiishi v Dariya Detkovskaya | 7-5,6-2 |
| ITF Women Toyota Qual | 2017/11/12 03:05 | Na Ri Kim v Ayumi Koshiishi | 6-3,6-2 |
| ITF Women Tokyo Qual | 2017/11/05 02:55 | Ayumi Koshiishi v Naomi Cheong | 6-7,1-6 |
| ITF Women Tokyo Qual | 2017/11/04 05:35 | Ayumi Koshiishi v Mitsumi Kawasaki | 6-4,5-7,6-4 |