Stadium: Court 7 Round: 54 Ground: Hardcourt outdoor
| ITF W25 Luzhou | 2019/05/28 06:15 | Ayumi Koshiishi v Jessica Ho | 3-6,1-6 |
| ITF W25 Luzhou | 2019/05/28 02:00 | Ayumi Koshiishi v WanNing Zhu | 6-0,6-1 |
| ITF W25 Goyang | 2019/05/21 01:00 | Chang Liu v Ayumi Koshiishi | 6-3,4-6,10-8 |
| ITF W25 Goyang | 2019/05/20 01:00 | Hyeran Yun v Ayumi Koshiishi | 4-6,3-6 |
| ITF W25 Changwon | 2019/05/14 01:00 | Ayumi Koshiishi v Dabin Oh | 6-3,3-6,5-10 |
| ITF W25 Changwon | 2019/05/13 01:00 | Ayumi Koshiishi v Si On Park | 6-0,6-1 |
| ITF W60 Fukuoka | 2019/05/06 01:00 | Mai Hontama v Ayumi Koshiishi | 3-6,6-3,10-2 |
| ITF W25 Hong Kong | 2019/04/08 02:00 | Ayumi Koshiishi v Mihika Yadav | 6-3,2-6,4-10 |
| ITF W25 Incheon | 2019/05/28 01:00 | Chanel Simmonds v Yeong Won Jeong | 6-2,6-3 |
| ITF W25 Incheon | 2019/05/27 05:25 | Hyeran Yun v Yeong Won Jeong | 6-7,3-6 |
| ITF W25 Goyang | 2019/05/23 02:00 | Maia Lumsden v Yeong Won Jeong | 6-1,6-1 |
| ITF W25 Goyang | 2019/05/22 01:00 | Hanna Chang v Yeong Won Jeong | 3-6,6-3,4-6 |
| ITF W25 Changwon | 2019/05/15 01:00 | Ya-Hsuan Lee v Yeong Won Jeong | 6-0,6-2 |
| ITF W25 Changwon | 2019/05/14 01:00 | Yeong Won Jeong v Dayeon Back | 6-4,6-1 |
| ITF W25 Changwon | 2019/05/13 04:15 | Yeong Won Jeong v Su Yeon Chun | 6-0,6-2 |
| ITF Women Antalya | 2018/12/14 10:05 | Yeong Won Jeong v Monica Robinson | 6-3,6-2 |