Stadium: Court 2 Round: 54
| ITF Women Fukuoka Qual | 2018/05/06 04:30 | Yukina Saigo v Imamura, Nagisa | 7-5,6-4 |
| ITF Women Osaka Qual | 2018/04/09 03:05 | Ya-Hsuan Lee v Yukina Saigo | 6-2,6-2 |
| ITF Women Osaka Qual | 2018/04/08 03:30 | Haruna Arakawa v Yukina Saigo | 5-7,3-6 |
| ITF Women Osaka Qual | 2018/04/08 01:00 | Yukina Saigo v Silich, Alina | 7-6,6-4 |
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/03/24 00:30 | Terami, Karin v Yukina Saigo | 6-1,0-6,6-4 |
| Nishi-Tama, Singles W-WITF-JPN-01A | 2018/03/20 05:00 | Sarah Rebecca Sekulic v Yukina Saigo | 6-0,6-0 |
| Nishi-Tama, Singles W-WITF-JPN-01A | 2018/03/19 01:00 | Yukina Saigo v Hasegawa, Mami | 3-6,4-6 |
| Nishi-Tama, Singles W-WITF-JPN-01A | 2018/03/17 01:00 | Yukina Saigo v Shuto, Minami | 6-3,6-1 |
| ITF Women Fukuoka Qual | 2018/05/06 07:00 | Sakamoto, Haruna v Erina Hayashi | 1-6,2-6 |
| ITF Women Gifu Qual | 2018/04/30 01:00 | Hiroko Kuwata v Erina Hayashi | 6-2,7-6 |
| ITF Women Gifu Qual | 2018/04/29 04:40 | Emily Webley-Smith v Erina Hayashi | 4-6,6-4,4-6 |
| ITF Women Gifu Qual | 2018/04/29 01:00 | Dabin Kim v Erina Hayashi | 6-7,3-6 |
| ITF Women Osaka Qual | 2018/04/09 02:25 | Erina Hayashi v Ninomiya, Makoto | 6-1,6-7,2-6 |
| ITF Women Osaka Qual | 2018/04/08 02:00 | Erina Hayashi v Mai Hontama | 6-0,6-4 |
| ITF Women Osaka Qual | 2018/04/08 01:00 | Erina Hayashi v Furuya, Michiru | 6-3,6-3 |
| Nishi-Tama, Singles W-WITF-JPN-01A | 2018/03/20 02:40 | Erina Hayashi v Okuno, Ayaka | 0-6,7-6,3-6 |