Stadium: Court 3 Round: 62 Ground: Synthetic outdoor
| ITF Women Hamamatsu | 2018/10/14 02:00 | Ryoko Ikeda v Rina Saigo | 6-4,0-6,4-6 |
| ITF Women Makinohara | 2018/10/07 00:30 | Sakura Hondo v Rina Saigo | 6-3,6-2 |
| ITF Women Kyoto | 2018/09/06 02:25 | Himeno Sakatsume v Rina Saigo | 6-1,6-3 |
| ITF Women Kyoto | 2018/09/05 04:45 | Rina Saigo v Ramu Ueda | 6-1,6-1 |
| ITF Women Kyoto | 2018/09/04 03:00 | Rina Saigo v Yu-Ting Hsieh | 6-2,6-1 |
| ITF Women Kyoto | 2018/09/03 01:00 | Rina Saigo v Yuika Sano | 6-4,6-1 |
| ITF Women Nanao | 2018/08/29 03:30 | Rina Saigo v Ayano Shimizu | 2-6,3-6 |
| ITF Women Tsukuba | 2018/08/20 01:00 | Rina Saigo v Kumi So | 3-6,1-6 |
| ITF Women Hamamatsu | 2018/10/14 02:00 | Miyu Nakashima v Sakura Hosogi | 6-4,7-5 |
| ITF Women Kyoto | 2018/09/02 03:00 | Miyu Nakashima v Mayuka Aikawa | 4-6,4-6 |