Stadium: Court 3 Round: 54 Ground: Hardcourt outdoor
| ITF Women Sangju | 2018/06/06 01:00 | Okuno, Ayaka v Yea, Hyojung | 6-3,6-3 |
| ITF Women Yeongwol | 2018/09/04 03:00 | Eunji Lim v Yea, Hyojung | 6-4,1-6,4-6 |
| ITF Women Yeongwol | 2018/08/30 03:05 | Yea, Hyojung v Dabin Kim | 4-6,3-6 |
| ITF Women Yeongwol | 2018/08/29 07:30 | Da Ye Kim v Yea, Hyojung | 4-6,2-6 |
| ITF Women Gimcheon | 2018/08/23 05:30 | Sohyun Park v Yea, Hyojung | 7-5,3-6,6-4 |
| ITF Women Gimcheon | 2018/08/16 01:00 | Yea, Hyojung v Kim, SE-Hyun | 0-6,2-6 |
| ITF Women Gimcheon | 2018/08/15 01:00 | Yea, Hyojung v Han, Heejin | 6-2,7-5 |
| ITF Women Daegu Qual | 2018/06/19 01:00 | Zhibek Kulambayeva v Yea, Hyojung | 4-6,7-6,7-5 |
| ITF Women Daegu Qual | 2018/06/18 03:25 | Yea, Hyojung v Takayama, Chihiro | 6-3,6-0 |
| ITF W25 Incheon | 2019/05/29 02:55 | Choi, Ji-Hee v Okuno, Ayaka | 6-3,3-6,6-2 |
| ITF W25 Incheon | 2019/05/28 01:00 | Youn, Eunseo v Okuno, Ayaka | 1-6,0-6 |
| ITF W25 Incheon | 2019/05/27 03:30 | Laguza, Anna v Okuno, Ayaka | 4-6,6-0,8-10 |
| Karuizawa, Singles W-ITF-JPN-12A | 2019/05/21 05:40 | Matsumoto, Ari v Okuno, Ayaka | 4-6,6-2,10-7 |
| Karuizawa, Singles W-ITF-JPN-12A | 2019/05/20 03:00 | Hisamatsu, Shiho v Okuno, Ayaka | 4-6,2-6 |
| Kurume, Singles W-ITF-JPN-11A | 2019/05/13 01:55 | Alexandra Bozovic v Okuno, Ayaka | 6-3,6-3 |
| Fukuoka, Singles W-ITF-JPN-10A | 2019/05/06 03:05 | Okuno, Ayaka v Leonie Kung | 3-6,3-6 |
| Charlottesville, Simples W-ITF-USA-13A | 2019/04/23 16:20 | Emily Fanning v Okuno, Ayaka | 4-6,6-2,10-3 |