Stadium: I Round: 54
| ITF Women Kurume Qual | 2017/05/14 08:15 | Мей Ямагучи v Kotomi Takahata | 6-1,7-6 |
| ITF Women Iizuka Qual | 2016/09/26 01:00 | Kotomi Takahata v Мей Ямагучи | 6-2,6-1 |
| ITF Women Fukuoka | 2018/05/09 04:20 | Мей Ямагучи v Арина Родионова | 0-6,5-7 |
| ITF Women Gifu | 2018/05/01 01:00 | Мей Ямагучи v Момоко Кобори | 6-4,3-6,3-6 |
| ITF Women Gifu Qual | 2018/04/30 03:00 | Макото Ниномия v Мей Ямагучи | 6-4,4-6,4-6 |
| ITF Women Gifu Qual | 2018/04/29 04:20 | Мей Ямагучи v Yuki Kristina Chiang | 6-1,6-2 |
| ITF Women Osaka Qual | 2018/04/08 03:30 | Я-Хсуан Ли v Мей Ямагучи | 3-6,6-1,6-4 |
| ITF Women Kofu Qual | 2018/03/25 01:00 | Мей Ямагучи v Киока Окамура | 6-1,3-6,1-6 |
| ITF Women Kofu Qual | 2018/03/24 00:30 | Мей Ямагучи v Сузухо Ошино | 6-1,7-6 |
| ITF Women Nishi-Tama | 2018/03/20 06:45 | Мей Ямагучи v Yuuki Tanaka | 6-4,3-6,1-6 |
| ITF Women Gifu Qual | 2018/04/29 01:00 | Емили Уебли-Смит v Kotomi Takahata | 6-3,6-2 |
| ITF Women Quanzhou Qual | 2018/04/21 07:45 | Вушуанг Женг 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 Мичиру Фуруя | 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 |