Round: 44 Ground: Hardcourt outdoor
| Daegu, Singles W-ITF-KOR-04A | 2019/06/03 01:00 | Hong, Seung-Yeon v Yoshitomi, Aiko | 4-6,4-6 |
| ITF W25 Incheon | 2019/05/27 03:10 | Pei-Chi Lee v Hong, Seung-Yeon | 6-3,4-6,10-7 |
| ITF W25 Goyang | 2019/05/21 02:15 | Hong, Seung-Yeon v Yeon Woo Ku | 0-6,2-6 |
| ITF W25 Goyang | 2019/05/20 05:05 | Jeong, Sunam v Hong, Seung-Yeon | 6-2,3-6,2-10 |
| ITF Women Yeongwol | 2018/09/06 03:00 | Hong, Seung-Yeon v Jeong, Sunam | 4-6,3-6 |
| ITF Women Yeongwol | 2018/09/05 03:10 | Lee, SE Jin v Hong, Seung-Yeon | 3-6,3-6 |
| ITF Women Gimcheon | 2018/08/17 01:00 | Hong, Seung-Yeon v Joanna Garland | 5-7,1-6 |
| ITF Women Gimcheon | 2018/08/16 01:00 | Hong, Seung-Yeon v Jeong, Yeong Won | 7-5,6-4 |
| Gimcheon, Singles Qualifying W-ITF-KOR-05A | 2019/06/17 03:25 | Kang, Choyeon v Hwiwon Wi | 2-6,1-6 |