Stadium: Court B4 Round: 25
| ITF Women Gifu Qual | 2018/04/30 03:00 | Ninomiya, Makoto v Mei Yamaguchi | 6-4,4-6,4-6 |
| ITF Women Gifu Qual | 2018/04/29 04:20 | Mei Yamaguchi v Chiang, Yuki Kristina | 6-1,6-2 |
| ITF Women Osaka Qual | 2018/04/08 03:30 | Ya-Hsuan Lee v Mei Yamaguchi | 3-6,6-1,6-4 |
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/03/25 01:00 | Mei Yamaguchi v Kyoka Okamura | 6-1,3-6,1-6 |
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/03/24 00:30 | Mei Yamaguchi v Oshino, Suzuho | 6-1,7-6 |
| Nishi-Tama, Singles W-WITF-JPN-01A | 2018/03/20 06:45 | Mei Yamaguchi v Tanaka, Yuuki | 6-4,3-6,1-6 |
| Nishi-Tama, Singles W-WITF-JPN-01A | 2018/03/19 01:00 | Mei Yamaguchi v Chimura, Momoka | 6-4,6-1 |
| Nishi-Tama, Singles W-WITF-JPN-01A | 2018/03/18 01:00 | Mei Yamaguchi v Sueno, Satoko | 6-1,6-2 |
| ITF Women Osaka | 2018/04/12 01:00 | Shiho Akita v Momoko Kobori | 3-6,6-2,6-2 |
| ITF Women Osaka | 2018/04/11 01:00 | Momoko Kobori v Ayano Shimizu | 6-4,6-4 |
| ITF Women Kashiwa | 2018/04/03 02:35 | Na-Lae Han v Momoko Kobori | 6-3,6-0 |
| ITF Women Kashiwa Qual | 2018/04/02 02:35 | Momoko Kobori v Jeong, Sunam | 6-0,6-2 |
| ITF Women Kashiwa Qual | 2018/04/01 05:00 | Momoko Kobori v Chiang, Yuki Kristina | 6-2,6-3 |
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/03/26 03:55 | Momoko Kobori v Rebecca Marino | 6-2,2-6,3-6 |
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/03/25 02:30 | Momoko Kobori v Chan, Chin-Wei | 6-2,6-2 |
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/03/24 03:00 | Momoko Kobori v Yoshitomi, Yumeko | 6-0,6-1 |