Stadium: Court 11 Round: 54
| ITF Women Fukuoka Qual | 2017/05/07 06:50 | Takayama, Chihiro v Yukina Saigo | 6-3,5-7,4-6 |
| ITF Women Kurume Qual | 2018/05/14 01:00 | Yukina Saigo v Hondo, Sakura | 3-6,6-4,5-7 |
| ITF Women Kurume Qual | 2018/05/13 00:30 | Moyuka Uchijima v Yukina Saigo | 6-1,3-6,1-6 |
| ITF Women Fukuoka Qual | 2018/05/07 03:55 | Yukina Saigo v Erina Hayashi | 4-6,5-7 |
| 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 |
| ITF Women Kurume Qual | 2018/05/14 02:30 | Matsumoto, Ari v Takayama, Chihiro | 1-6,6-3,6-2 |
| ITF Women Kurume Qual | 2018/05/13 09:35 | Takayama, Chihiro v Kinard, Tori | 2-6,7-5,6-3 |
| ITF Women Fukuoka Qual | 2018/05/06 02:20 | Yoshitomi, Aiko v Takayama, Chihiro | 6-2,6-3 |
| ITF Women Osaka Qual | 2018/04/07 05:30 | Takayama, Chihiro v Miyamoto, Ayumi | 2-6,4-6 |
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/03/24 00:30 | Lykina, Ksenia v Takayama, Chihiro | 7-6,6-3 |
| Nishi-Tama, Singles W-WITF-JPN-01A | 2018/03/19 01:00 | Lee, So-Ra v Takayama, Chihiro | 6-3,7-5 |
| Nishi-Tama, Singles W-WITF-JPN-01A | 2018/03/18 01:00 | Kishigami, Utaka v Takayama, Chihiro | 2-6,4-6 |
| Nishi-Tama, Singles W-WITF-JPN-01A | 2018/03/17 01:00 | Furukawa, Suzuka v Takayama, Chihiro | 4-6,2-6 |