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