Stadium: Court 4 Round: 54 Ground: Hardcourt outdoor
| ITF Women Yeongwol | 2018/08/29 02:55 | Hanna Chang v Yun, Hyeran | 6-3,6-2 |
| ITF Women Yeongwol | 2018/08/28 02:00 | Ashmitha Easwaramurthi v Yun, Hyeran | 1-6,2-6 |
| ITF Women Yeongwol | 2018/08/27 04:30 | Yoo, Jin v Yun, Hyeran | 5-7,1-6 |
| Changwon, Singles Qualifying W-WITF-KOR-01A | 2018/05/21 03:30 | Yun, Hyeran v Park, Sang Hee | 3-6,5-7 |
| Changwon, Singles Qualifying W-WITF-KOR-01A | 2018/05/20 06:00 | Yun, Hyeran v Ji Min Park | 6-3,6-1 |
| ITF Women Goyang Qual | 2018/05/06 05:15 | Ahn, Yu Jin v Yun, Hyeran | 6-0,6-4 |
| ITF Women Sangju | 2017/05/28 01:00 | Yun, Hyeran v Oh, Soo Bin | 4-6,6-4,2-6 |
| ITF Women Goyang Qual | 2017/05/22 02:00 | Zhang, Ling v Yun, Hyeran | 6-4,6-3 |
| ITF W25 Changwon | 2019/05/14 01:00 | Ayumi Koshiishi v Oh, Soo Bin | 6-3,3-6,5-10 |
| ITF W25 Changwon | 2019/05/13 01:00 | Ayumi Koshiishi v Park, SI On | 6-0,6-1 |
| Fukuoka, Singles W-ITF-JPN-10A | 2019/05/06 01:00 | Mai Hontama v Ayumi Koshiishi | 3-6,6-3,10-2 |
| Hong Kong, Simples W-ITF-HKG-01B | 2019/04/08 02:00 | Ayumi Koshiishi v Yadav, Mihika | 6-3,2-6,4-10 |
| Jackson, Singles W-ITF-USA-09A | 2019/04/03 16:40 | Ayumi Koshiishi v Ann Li | 1-6,2-6 |
| Jackson, Singles W-ITF-USA-09A | 2019/04/02 15:00 | Ayumi Koshiishi v Yakubovich, Alesya | 6-3,6-2 |
| ITF W25 Canberra | 2019/03/25 00:00 | Ayumi Koshiishi v Tanaka, Yuuki | 3-6,1-6 |
| Xiamen, Singles W-ITF-CHN-05A | 2019/03/22 03:35 | Ayumi Koshiishi v Eudice Chong | 2-6,3-6 |