Stadium: Court B4 Round: 25
| ITF Women Gifu Qual | 2018/04/30 03:00 | Makoto Ninomiya v Mei Yamaguchi | 6-4,4-6,4-6 |
| ITF Women Gifu Qual | 2018/04/29 04:20 | Mei Yamaguchi v Yuki Kristina Chiang | 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 |
| ITF Women Kofu Qual | 2018/03/25 01:00 | Mei Yamaguchi v Kyoka Okamura | 6-1,3-6,1-6 |
| ITF Women Kofu Qual | 2018/03/24 00:30 | Mei Yamaguchi v Suzuho Oshino | 6-1,7-6 |
| ITF Women Nishi-Tama | 2018/03/20 06:45 | Mei Yamaguchi v Yuuki Tanaka | 6-4,3-6,1-6 |
| ITF Women Nishi-Tama | 2018/03/19 01:00 | Mei Yamaguchi v Momoka Chimura | 6-4,6-1 |
| ITF Women Nishi-Tama | 2018/03/18 01:00 | Mei Yamaguchi v Satoko Sueno | 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 Sunam Jeong | 6-0,6-2 |
| ITF Women Kashiwa Qual | 2018/04/01 05:00 | Momoko Kobori v Yuki Kristina Chiang | 6-2,6-3 |
| ITF Women Kofu Qual | 2018/03/26 03:55 | Momoko Kobori v Rebecca Marino | 6-2,2-6,3-6 |
| ITF Women Kofu Qual | 2018/03/25 02:30 | Momoko Kobori v Chin-Wei Chan | 6-2,6-2 |
| ITF Women Kofu Qual | 2018/03/24 03:00 | Momoko Kobori v Yumeko Yoshitomi | 6-0,6-1 |