Stadium: Center Court Round: 62
| ITF Women Osaka Qual | 2018/04/08 03:30 | Ya-Hsuan Lee v Mei Yamaguchi | 3-6,6-1,6-4 |
| ITF Women Osaka Qual | 2018/04/07 02:30 | Ya-Hsuan Lee v Sakura Hondo | 6-3,6-1 |
| ITF Women Kashiwa Qual | 2018/04/02 01:00 | Yuxuan Zhang v Ya-Hsuan Lee | 6-2,6-1 |
| ITF Women Kashiwa Qual | 2018/04/01 03:00 | Nao Nishida v Ya-Hsuan Lee | 1-6,0-6 |
| ITF Women Toyota | 2018/03/14 02:35 | Ya-Hsuan Lee v Junri Namigata | 4-6,2-6 |
| ITF Women Toyota Qual | 2018/03/12 03:25 | Momoko Kobori v Ya-Hsuan Lee | 7-5,2-6,1-6 |
| ITF Women Toyota Qual | 2018/03/11 01:00 | Yuki Kristina Chiang v Ya-Hsuan Lee | 1-6,0-6 |
| ITF Women Toyota Qual | 2018/03/10 03:00 | So-Ra Lee v Ya-Hsuan Lee | 6-7,3-6 |
| 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 Alina Silich | 7-6,6-4 |
| ITF Women Kofu Qual | 2018/03/24 00:30 | Karin Terami v Yukina Saigo | 6-1,0-6,6-4 |
| ITF Women Nishi-Tama | 2018/03/20 05:00 | Sarah Rebecca Sekulic v Yukina Saigo | 6-0,6-0 |
| ITF Women Nishi-Tama | 2018/03/19 01:00 | Yukina Saigo v Mami Hasegawa | 3-6,4-6 |
| ITF Women Nishi-Tama | 2018/03/17 01:00 | Yukina Saigo v Minami Shuto | 6-3,6-1 |
| ITF Women Mallorca | 2018/02/27 09:55 | Yukina Saigo v Estrella Cabeza Candela | 0-6,1-6 |
| ITF Women Mallorca | 2018/02/25 08:30 | Yukina Saigo v Daniella Medvedeva | 6-4,4-6,6-2 |