Stadium: Court A7 Round: 62 Ground: Synthetic outdoor
| ITF Women Tsukuba | 2018/08/19 03:00 | Kumi So v Kotomi Takahata | 6-4,6-4 |
| ITF Women Taipei | 2018/07/24 03:55 | Chin-Wei Chan v Kotomi Takahata | 4-6,6-3,6-3 |
| ITF Women Astana Qual | 2018/07/14 10:45 | Daria Kruzhkova v Kotomi Takahata | 6-2,6-1 |
| ITF Women Tianjin Qual | 2018/07/09 02:00 | Kotomi Takahata v Mei Xu Wu | 3-6,6-2,2-6 |
| ITF Women Tianjin Qual | 2018/07/08 06:35 | Kotomi Takahata v Qian Yang | 6-0,6-2 |
| ITF Women Daegu | 2018/06/21 01:00 | Su Jeong Jang v Kotomi Takahata | 6-3,7-5 |
| ITF Women Daegu | 2018/06/20 05:45 | Kotomi Takahata v Satsuki Koike | 6-4,7-5 |
| ITF Women Daegu Qual | 2018/06/19 01:00 | Kotomi Takahata v Seung-Yeon Hong | 6-4,3-6,6-3 |
| ITF Women Antalya | 2018/06/04 07:30 | Ayano Sonoda v Marie Mettraux | 1-6,1-6 |
| ITF Women Antalya | 2018/05/30 09:10 | Ayano Sonoda v Melis Sezer | 0-6,2-6 |
| ITF Women Antalya Qual | 2018/05/28 11:10 | Ayano Sonoda v Stephanie Belovukovic | 7-6,1-6,5-7 |
| ITF Women Kurume Qual | 2018/05/13 08:40 | Mitsumi Kawasaki v Ayano Sonoda | 6-1,6-1 |
| ITF Women Nishi-Tama | 2018/03/17 01:00 | Ayano Sonoda v Sakura Hosogi | 4-6,4-6 |
| ITF Women Antalya | 2018/01/27 06:30 | Ayano Sonoda v Chihiro Takayama | 0-6,0-6 |
| ITF Women Antalya | 2018/01/21 11:00 | Ayano Sonoda v Polina Altukhova | 2-6,4-6 |
| ITF Women Antalya | 2018/01/15 08:00 | Ayano Sonoda v Daniela Schippers | 2-6,3-6 |