Stadium: Court 13 Round: 54
| ITF Women Karuizawa Qual | 2017/05/21 01:00 | Rina Saigo v Baba, Sari | 4-6,2-6 |
| ITF Women Kyoto | 2016/09/04 01:00 | Kamiyoshihara, Ai 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 Tucepi | 2018/04/26 09:00 | Tena Lukas v Kitagawa, Rio | 6-0,1-6,6-1 |
| ITF Women Tucepi | 2018/04/24 09:00 | Kitagawa, Rio v Anna Klasen | 7-6,5-7,6-4 |
| ITF Women Tucepi | 2018/04/23 08:00 | Kitagawa, Rio v Surova, Viktoria | 6-4,6-2 |
| Sharm El Sheikh, Singles W-WITF-EGY-09A | 2018/04/12 10:25 | Kitagawa, Rio v Julia Terziyska | 0-6,1-6 |
| Sharm El Sheikh, Singles W-WITF-EGY-09A | 2018/04/11 09:50 | Ashmitha Easwaramurthi v Kitagawa, Rio | 2-6,0-6 |
| Sharm El Sheikh, Singles W-WITF-EGY-09A | 2018/04/09 08:00 | Walters, Alexandra v Kitagawa, Rio | 3-6,2-6 |
| Sharm El Sheikh, Singles W-WITF-EGY-09A | 2018/04/08 08:00 | Panfilov, Lara v Kitagawa, Rio | 6-7,6-2,3-6 |
| Sharm El Sheikh, Singles W-WITF-EGY-09A | 2018/04/01 08:00 | Kitagawa, Rio v Olga Helmi | 3-6,3-6 |