Stadium: Court 9 Round: 25
| ITF Women Gifu Qual | 2018/04/29 03:10 | Mai Hontama v Ayaka Okuno | 5-7,7-6,6-2 |
| ITF Women Quanzhou Qual | 2018/04/21 05:45 | Ao Gai v Ayaka Okuno | 6-3,6-4 |
| ITF Women Kashiwa Qual | 2018/04/01 03:00 | Ayaka Okuno v Shiho Akita | 1-6,0-6 |
| ITF Women Kofu Qual | 2018/03/25 02:30 | Ayaka Okuno v Alina Silich | 1-6,1-6 |
| ITF Women Kofu Qual | 2018/03/24 04:00 | Charlotte Robillard-Millette v Ayaka Okuno | 1-6,1-6 |
| ITF Women Nishi-Tama | 2018/03/23 01:00 | Ayaka Okuno v So-Ra Lee | 3-6,4-6 |
| ITF Women Nishi-Tama | 2018/03/22 03:00 | Yuki Kristina Chiang v Ayaka Okuno | 6-1,5-7,1-6 |
| ITF Women Nishi-Tama | 2018/03/20 02:40 | Erina Hayashi v Ayaka Okuno | 0-6,7-6,3-6 |