Stadium: Court B4 Round: 54 Ground: Hardcourt outdoor
| ITF Women Tsukuba | 2018/08/19 03:00 | Ching-Wen Hsu v Rina Saigo | 6-3,0-6,5-7 |
| ITF Women Karuizawa | 2018/05/23 01:00 | Rina Saigo v Abbie Myers | 6-7,3-6 |
| ITF Women Karuizawa Qual | 2018/05/21 01:00 | Mitsumi Kawasaki v Rina Saigo | 1-6,2-6 |
| ITF Women Karuizawa Qual | 2018/05/20 02:30 | Rina Saigo v Rio Kitagawa | 6-2,6-3 |
| ITF Women Karuizawa Qual | 2017/05/21 01:00 | Rina Saigo v Sari Baba | 4-6,2-6 |
| ITF Women Kyoto | 2016/09/04 01:00 | Ai Kamiyoshihara v Rina Saigo | 6-7,7-5,6-3 |
| ITF Women Noto Qual | 2016/08/28 01:00 | Rina Saigo v Himeno Sakatsume | 6-2,3-6,4-6 |
| ITF Women Hong Kong | 2016/07/10 02:00 | Alexandra Bozovic v Rina Saigo | 6-2,6-2 |
| ITF Women Tsukuba | 2018/08/19 03:00 | Kumi So v Kotomi Takahata | 6-4,6-4 |
| 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 |