Stadium: Court 4 Round: 62
| ITF Women Incheon Qual | 2018/05/13 03:30 | Freya Christie v Ayumi Koshiishi | 4-6,2-6 |
| ITF Women Goyang | 2018/05/09 04:55 | Ayumi Koshiishi v So-Ra Lee | 6-7,3-6 |
| ITF Women Goyang Qual | 2018/05/08 05:05 | Yexin Ma v Ayumi Koshiishi | 4-6,3-6 |
| ITF Women Goyang Qual | 2018/05/07 03:30 | Jin Yoo v Ayumi Koshiishi | 3-6,3-6 |
| ITF Women Gifu Qual | 2018/04/29 01:00 | Yuka Asano v Ayumi Koshiishi | 3-6,1-6 |
| ITF Women Osaka Qual | 2018/04/07 01:30 | Ayumi Koshiishi v Akiko Omae | 3-6,2-6 |
| ITF Women Kofu Qual | 2018/03/25 01:00 | Ksenia Lykina v Ayumi Koshiishi | 7-5,6-7,6-3 |
| ITF Women Kofu Qual | 2018/03/24 00:30 | Ayumi Koshiishi v Haruna Arakawa | 7-5,6-4 |
| ITF Women Incheon Qual | 2018/05/13 03:30 | Han Byeol Lee v Seo-Kyung Kang | 1-6,3-6 |
| ITF Women Goyang | 2018/05/09 01:00 | Na Ri Kim v Seo-Kyung Kang | 6-1,0-6,6-4 |
| 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 01:30 | Seo-Kyung Kang v Dominique Schaefer | 6-3,3-6,6-4 |
| ITF Women Goyang Qual | 2018/05/06 05:15 | Madison Frahn v Seo-Kyung Kang | 4-6,0-6 |
| ITF Women Yeongwol | 2017/09/05 02:00 | Seo-Kyung Kang v Ching-Wen Hsu | 6-3,2-6,3-6 |
| ITF Women Yeongwol | 2017/08/31 02:50 | Pei-Chi Lee v Seo-Kyung Kang | 7-6,6-4 |
| ITF Women Yeongwol | 2017/08/30 06:10 | Alexandra Walters v Seo-Kyung Kang | 3-6,5-7 |