Stadium: Court C1 Round: 54 Ground: Hardcourt outdoor
| ITF Women Figueira Da Foz Qual | 2018/07/16 12:00 | Cristina Bucsa v Kumi So | 6-1,6-0 |
| ITF Women Setubal Qual | 2018/07/08 13:00 | Kelly Williford v Kumi So | 2-6,6-7 |
| ITF Women Corroios-Seixal | 2018/07/05 11:00 | Eden Silva v Kumi So | 6-2,6-3 |
| ITF Women Corroios-Seixal | 2018/07/03 11:30 | Clemence Fayol v Kumi So | 6-2,4-6,3-6 |
| ITF Women Sharm El Sheikh | 2018/04/10 08:00 | Kumi So v Iryna Shymanovich | 4-6,4-6 |
| ITF Women Sharm El Sheikh | 2018/04/05 11:00 | Angelina Gabueva v Kumi So | 6-2,6-3 |
| ITF Women Sharm El Sheikh | 2018/04/04 08:00 | Kumi So v Rutuja Bhosale | 6-2,6-2 |
| ITF Women Yokohama Qual | 2018/03/04 02:30 | Harriet Dart v Kumi So | 6-3,6-3 |
| 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 Daegu Qual | 2018/06/18 03:30 | Kotomi Takahata v Yu Jin Ahn | 6-1,6-4 |