| 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 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 Kyoto | 2018/09/04 03:35 | Haruna Inoue v Ramu Ueda | 3-6,1-6 |
| ITF Women Nanao | 2018/08/28 03:00 | Ramu Ueda v Chihiro Muramatsu | 2-6,5-7 |
| ITF Women LPD Gran Canaria Qual | 2018/08/12 10:30 | Ramu Ueda v Karine Sarkisova | 4-6,2-6 |
| ITF Women LPD Gran Canaria | 2018/08/08 09:00 | Ramu Ueda v Yvonne Cavalle-Reimers | 3-6,2-6 |
| ITF Women LPD Gran Canaria Qual | 2018/08/05 10:00 | Ramu Ueda v Andrea Lazaro Garcia | 1-6,5-7 |
| ITF Women LPD Gran Canaria Qual | 2018/08/04 14:30 | Ramu Ueda v Maria Zotova | 6-1,6-2 |
| ITF Women Porto Qual | 2018/07/23 11:55 | Ramu Ueda v Irys Ekani | 1-6,3-6 |
| ITF Women Porto Qual | 2018/07/22 10:30 | Ramu Ueda v Sara Lanca | 6-0,6-2 |