Stadium: Court G Round: 62 Ground: Hardcourt outdoor
| ITF Women Toyota Qual | 2018/03/10 03:00 | Shiho Akita v Kei Kato | 6-0,6-3 |
| ITF Women Tokyo Qual | 2017/11/04 01:00 | Kei Kato v Tori Kinard | 7-6,3-6,1-6 |
| ITF Women Hamamatsu Qual | 2017/10/17 06:00 | Kei Kato v Ange Oby Kajuru | 1-6,4-6 |
| ITF Women Tsukuba Qual | 2017/08/20 00:30 | Kei Kato v Yukina Saigo | 1-6,4-6 |
| ITF Women Tokyo Qual | 2017/06/05 01:00 | Kyoka Okamura v Kei Kato | 6-1,6-1 |
| ITF Women Tokyo Qual | 2017/06/04 02:15 | Moyuka Uchijima v Kei Kato | 5-7,5-7 |
| ITF Women Karuizawa Qual | 2017/05/22 02:55 | Kei Kato v Moyuka Uchijima | 4-6,2-6 |
| ITF Women Karuizawa Qual | 2017/05/21 04:00 | Kei Kato v Ran Miyachi | 6-4,6-0 |
| ITF Women Toyota Qual | 2018/03/10 01:00 | Ji-Hee Choi v Ayumi Koshiishi | 4-6,6-3,6-2 |
| ITF Women Hong Kong | 2018/01/01 03:35 | Risa Ushijima v Ayumi Koshiishi | 6-1,3-6,7-5 |
| 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 |