Stadium: Court 15 Round: 54 Ground: Hardcourt outdoor
| ITF Women Goyang Qual | 2017/05/21 01:00 | Lee, Jeongyun v Sul, You-Na | 2-6,3-6 |
| Gimcheon, Singles Qualifying W-ITF-KOR-05A | 2019/06/11 01:00 | Um, Seon Young v Lee, Jeongyun | 6-1,6-7,10-4 |
| Gimcheon, Singles Qualifying W-ITF-KOR-05A | 2019/06/10 01:00 | Lee, Jeongyun v Oshino, Suzuho | 6-3,3-6,10-7 |
| ITF Women Yeongwol | 2018/09/05 01:00 | Lee, Jeongyun v Hwiwon Wi | 5-7,5-7 |
| ITF Women Yeongwol | 2018/08/29 03:35 | Yuka Hosoki v Lee, Jeongyun | 2-6,6-7 |
| ITF Women Gimcheon | 2018/08/21 01:00 | Oh, Soo Bin v Lee, Jeongyun | 6-4,6-3 |
| ITF Women Gimcheon | 2018/08/20 01:00 | Lee, Jeongyun v Park, Seo Yeon | 6-2,6-2 |
| ITF Women Daegu Qual | 2018/06/17 01:00 | Yea, Hyojung v Lee, Jeongyun | 6-2,6-1 |
| ITF Women Gyeongsan Qual | 2018/06/10 03:30 | Koike, Satsuki v Lee, Jeongyun | 7-6,6-1 |
| Gimcheon, Singles Qualifying W-ITF-KOR-05A | 2019/06/11 01:00 | Eunhye Lee v Sul, You-Na | 6-1,6-4 |
| ITF W25 Changwon | 2019/05/15 02:55 | Kim, SE-Hyun v Sul, You-Na | 6-0,6-1 |
| ITF W25 Changwon | 2019/05/14 01:00 | Eunji Lim v Sul, You-Na | 3-6,6-4,4-10 |
| ITF W25 Changwon | 2019/05/13 02:50 | Kim, Handeul v Sul, You-Na | 0-6,0-6 |
| ITF Women Yeongwol | 2018/08/29 01:00 | Reina Takahashi v Sul, You-Na | 6-1,2-6,7-5 |
| ITF Women Gimcheon | 2018/08/23 02:20 | Sul, You-Na v Natarajan, Ramya | 6-7,6-7 |
| ITF Women Gimcheon | 2018/08/22 01:00 | Gabueva, Angelina v Sul, You-Na | 5-7,6-7 |
| ITF Women Gimcheon | 2018/08/21 02:00 | Nicole Khirin v Sul, You-Na | 1-6,0-6 |