Stadium: I Round: 54
| ITF Women Kurume Qual | 2017/05/14 08:15 | Mei Yamaguchi v Kotomi Takahata | 6-1,7-6 |
| ITF Women Iizuka Qual | 2016/09/26 01:00 | Kotomi Takahata v Mei Yamaguchi | 6-2,6-1 |
| ITF Women Fukuoka | 2018/05/09 04:20 | Mei Yamaguchi v Arina Rodionova | 0-6,5-7 |
| ITF Women Gifu | 2018/05/01 01:00 | Mei Yamaguchi v Momoko Kobori | 6-4,3-6,3-6 |
| 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 Gifu Qual | 2018/04/29 01:00 | Emily Webley-Smith v Kotomi Takahata | 6-3,6-2 |
| ITF Women Quanzhou Qual | 2018/04/21 07:45 | Wushuang Zheng v Kotomi Takahata | 6-1,6-1 |
| ITF Women Kofu Qual | 2018/03/25 02:30 | Mami Hasegawa v Kotomi Takahata | 6-2,7-6 |
| ITF Women Kofu Qual | 2018/03/24 04:00 | Chie Kezuka v Kotomi Takahata | 4-6,5-7 |
| ITF Women Nishi-Tama | 2018/03/19 01:00 | Kotomi Takahata v Michiru Furuya | 7-6,5-7,4-6 |
| ITF Women Nishi-Tama | 2018/03/18 01:00 | Kotomi Takahata v Kiko Nishizato | 6-3,6-3 |
| ITF Women Nishi-Tama | 2018/03/17 04:00 | Kotomi Takahata v Sae Haraguchi | 6-1,6-1 |
| ITF Women Burnie Qual | 2018/01/27 23:00 | Jia Qi Ren v Kotomi Takahata | 6-7,6-3,6-1 |