| ITF Women Kofu Qual | 2017/03/27 04:00 | Kei Kato v Mari Osaka | 0-6,1-6 |
| ITF Women Kofu Qual | 2017/03/27 02:30 | Kumi So v Kei Kato | 2-6,6-7 |
| ITF Women Kofu Qual | 2017/03/25 01:00 | Kimika Sakata v Kei Kato | 4-6,3-6 |
| ITF Women Nishi-Tama | 2017/03/20 01:00 | Kei Kato v Rika Fujiwara | 3-6,0-6 |
| ITF Women Nishi-Tama | 2017/03/19 01:00 | Chihiro Takayama v Kei Kato | 1-6,2-6 |
| ITF Women Yokohama Qual | 2017/03/06 04:00 | Mai Minokoshi v Kei Kato | 6-2,6-7,6-2 |
| ITF Women Hong Kong | 2016/12/24 02:00 | Mingyang Liu v Kei Kato | 7-6,6-3 |
| ITF Women Hamamatsu | 2016/10/19 05:40 | Kei Kato v Shuko Aoyama | 2-6,0-6 |