Stadium: Court 6 Round: 25
| Karuizawa, Singles W-WITF-JPN-10A | 2018/05/24 03:55 | Okuno, Ayaka v Myers, Abbie | 2-6,3-6 |
| Karuizawa, Singles W-WITF-JPN-10A | 2018/05/23 01:00 | Nefedova, Anastasia Evgenyevna v Okuno, Ayaka | 7-6,3-6,4-6 |
| ITF Women Kurume Qual | 2018/05/13 00:30 | Hondo, Sakura v Okuno, Ayaka | 6-7,6-4,7-6 |
| ITF Women Fukuoka Qual | 2018/05/06 07:05 | Inoue, Akari v Okuno, Ayaka | 6-1,6-4 |
| ITF Women Gifu Qual | 2018/04/29 03:10 | Mai Hontama v Okuno, Ayaka | 5-7,7-6,6-2 |
| Quanzhou, Qualifications Simples W-WITF-CHN-04B | 2018/04/21 05:45 | Gai, AO v Okuno, Ayaka | 6-3,6-4 |
| ITF Women Kashiwa Qual | 2018/04/01 03:00 | Okuno, Ayaka v Shiho Akita | 1-6,0-6 |
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/03/25 02:30 | Okuno, Ayaka v Silich, Alina | 1-6,1-6 |
| ITF Women Sangju Qual | 2018/06/05 02:05 | Yea, Hyojung v Sim, Mi Seong | 6-0,6-3 |
| ITF Women Sangju Qual | 2018/06/04 03:30 | Takayama, Chihiro v Yea, Hyojung | 2-6,1-6 |
| ITF Women Sangju Qual | 2018/06/03 02:00 | Yea, Hyojung v Jang, Eun SE | 6-2,6-3 |
| Changwon, Singles Qualifying W-WITF-KOR-01A | 2018/05/22 01:00 | Dabin Kim v Yea, Hyojung | 2-6,6-4,6-3 |
| Changwon, Singles Qualifying W-WITF-KOR-01A | 2018/05/21 01:00 | Yea, Hyojung v Kim, SE-Hyun | 6-1,1-6,6-0 |
| Changwon, Singles Qualifying W-WITF-KOR-01A | 2018/05/20 01:00 | Lee, Eun Ji v Yea, Hyojung | 2-6,0-6 |
| ITF Women Incheon Qual | 2018/05/13 02:00 | Silich, Alina v Yea, Hyojung | 6-4,2-6,7-6 |
| ITF Women Goyang Qual | 2018/05/07 01:00 | Yea, Hyojung v Barnett, Alicia | 1-6,4-6 |