Stadium: Court 7 Round: 44
| ITF Women Daegu Qual | 2018/06/17 02:00 | Sul, You-Na v Lee, Seunghyun | 6-3,6-1 |
| ITF Women Gyeongsan Qual | 2018/06/12 01:00 | Bizhukova, Fatima v Sul, You-Na | 6-1,6-0 |
| ITF Women Gyeongsan Qual | 2018/06/11 01:00 | Sul, You-Na v Yoon, So-Hee | 6-1,6-3 |
| ITF Women Changwon | 2018/05/22 04:15 | Victoria Rodriguez v Sul, You-Na | 5-7,7-5,6-1 |
| ITF Women Incheon Qual | 2018/05/13 01:00 | Sul, You-Na v Ahn, Yu Jin | 4-6,3-6 |
| ITF Women Goyang Qual | 2018/05/07 01:30 | Akiko Omae v Sul, You-Na | 6-4,6-3 |
| ITF Women Yeongwol | 2017/09/07 03:40 | Hong, Seung-Yeon v Sul, You-Na | 6-1,6-4 |
| ITF Women Yeongwol | 2017/09/06 01:00 | Lee, Dami v Sul, You-Na | 3-6,2-6 |
| ITF Women Gyeongsan | 2018/06/13 05:55 | Hosonuma, Chisa v Jeong, Yeong Won | 4-6,3-6 |
| ITF Women Gyeongsan Qual | 2018/06/12 01:00 | Jeong, Yeong Won v Hasegawa, Mami | 6-4,7-6 |
| ITF Women Gyeongsan Qual | 2018/06/11 02:00 | Jeong, Yeong Won v Kim, Da Hye | 6-1,7-6 |
| ITF Women Sangju Qual | 2018/06/04 01:00 | Jeong, Yeong Won v Eri Shimizu | 5-7,4-6 |
| Changwon, Singles Qualifying W-WITF-KOR-01A | 2018/05/20 03:00 | Routliffe, Erin v Jeong, Yeong Won | 6-1,6-2 |
| ITF Women Incheon Qual | 2018/05/14 03:30 | Jeong, Yeong Won v Routliffe, Erin | 4-6,0-6 |
| ITF Women Incheon Qual | 2018/05/13 03:30 | Jeong, Yeong Won v Eunji Lim | 6-3,6-3 |
| ITF Women Goyang | 2018/05/09 05:45 | Jeong, Yeong Won v Hibi, Mayo | 0-6,3-6 |