| ITF Women Daegu Qual | 2018/06/18 03:30 | Han, Sung-Hee v Song, Ah | 7-5,6-4 |
| ITF Women Daegu Qual | 2018/06/17 02:00 | Kim, Eunseo v Song, Ah | 1-6,3-6 |
| ITF Women Gyeongsan Qual | 2018/06/12 04:00 | Song, Ah v Haine Ogata | 5-7,4-6 |
| ITF Women Gyeongsan Qual | 2018/06/11 02:00 | Takayama, Chihiro v Song, Ah | 2-6,4-6 |
| ITF Women Gyeongsan Qual | 2018/06/10 02:00 | Song, Ah v Nagomi Higashitani | 7-5,4-6,7-5 |
| ITF Women Sangju | 2018/06/06 01:00 | Song, Ah v Kim, Ju-Eun | 4-6,2-6 |
| ITF Women Incheon Qual | 2018/05/14 02:00 | Flink, Varvara v Song, Ah | 6-1,6-0 |
| ITF Women Incheon Qual | 2018/05/13 03:30 | Song, Ah v Lee, Yubean | 6-4,1-6,6-1 |
| ITF Women Daegu Qual | 2018/06/18 03:30 | Takahata, Kotomi v Ahn, Yu Jin | 6-1,6-4 |
| ITF Women Daegu Qual | 2018/06/17 04:30 | Da Ye Kim v Ahn, Yu Jin | 6-0,5-7,3-6 |
| ITF Women Sangju | 2018/06/05 03:50 | Yoshitomi, Aiko v Ahn, Yu Jin | 6-1,6-1 |
| Changwon, Singles Qualifying W-WITF-KOR-01A | 2018/05/20 02:00 | Ahn, Yu Jin v Kim, Da Hye | 2-6,7-5,0-6 |
| ITF Women Incheon Qual | 2018/05/14 02:00 | Ya-Hsuan Lee v Ahn, Yu Jin | 6-3,6-1 |
| ITF Women Incheon Qual | 2018/05/13 01:00 | Sul, You-Na v Ahn, Yu Jin | 4-6,3-6 |
| ITF Women Goyang Qual | 2018/05/08 01:00 | Ahn, Yu Jin v Kang, Seo-Kyung | 4-6,2-6 |
| ITF Women Goyang Qual | 2018/05/07 00:30 | Maddison Inglis v Ahn, Yu Jin | 4-6,5-7 |