Stadium: Court 1 Round: 44
| ITF Women Gyeongsan | 2018/06/12 02:55 | Rio Kitagawa v Ayaka Okuno | 2-6,4-6 |
| ITF Women Daegu Qual | 2018/06/18 01:00 | Ayaka Okuno v Jin Ju Lee | 6-0,4-6,6-2 |
| ITF Women Gyeongsan | 2018/06/14 01:00 | Zhibek Kulambayeva v Ayaka Okuno | 7-5,2-6,6-1 |
| ITF Women Gyeongsan | 2018/06/12 02:55 | Rio Kitagawa v Ayaka Okuno | 2-6,4-6 |
| ITF Women Sangju | 2018/06/08 02:00 | Ayaka Okuno v Ya-Hsuan Lee | 2-6,0-6 |
| ITF Women Sangju | 2018/06/07 03:05 | Ayaka Okuno v Subin Park | 7-6,6-4 |
| ITF Women Sangju | 2018/06/06 01:00 | Ayaka Okuno v Hyojung Yea | 6-3,6-3 |
| ITF Women Karuizawa | 2018/05/24 03:55 | Ayaka Okuno v Abbie Myers | 2-6,3-6 |
| ITF Women Karuizawa | 2018/05/23 01:00 | Anastasia E Nefedova v Ayaka Okuno | 7-6,3-6,4-6 |
| ITF Women Daegu Qual | 2018/06/18 01:00 | Fatima Bizhukova v Rio Kitagawa | 2-6,0-6 |
| ITF Women Gyeongsan | 2018/06/12 02:55 | Rio Kitagawa v Ayaka Okuno | 2-6,4-6 |
| ITF Women Sangju | 2018/06/05 01:00 | Rio Kitagawa v Sunam Jeong | 0-6,3-6 |
| ITF Women Karuizawa Qual | 2018/05/20 02:30 | Rina Saigo v Rio Kitagawa | 6-2,6-3 |
| ITF Women Tucepi | 2018/04/26 09:00 | Tena Lukas v Rio Kitagawa | 6-0,1-6,6-1 |
| ITF Women Tucepi | 2018/04/24 09:00 | Rio Kitagawa v Anna Klasen | 7-6,5-7,6-4 |
| ITF Women Tucepi | 2018/04/23 08:00 | Rio Kitagawa v Viktoria Surova | 6-4,6-2 |
| ITF Women Sharm El Sheikh | 2018/04/12 10:25 | Rio Kitagawa v Julia Terziyska | 0-6,1-6 |