Stadium: Court 10 Round: 25 Ground: Hardcourt outdoor
| ITF W15 Gimcheon | 2019/06/14 02:00 | Ayumi Koshiishi v Misaki Matsuda | 5-7,7-6,3-6 |
| ITF W15 Gimcheon | 2019/06/13 01:30 | Ayumi Koshiishi v Shou Na Mu | 7-5,6-3 |
| ITF W15 Gimcheon | 2019/06/12 01:00 | Ayumi Koshiishi v Dayeon Back | 7-5,6-2 |
| ITF W25 Daegu | 2019/06/04 01:00 | Ayumi Koshiishi v So-Ra Lee | 7-5,6-2 |
| 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 W15 Gimcheon | 2019/06/18 01:00 | Honoka Kobayashi v Chihiro Takayama | 6-1,6-1 |
| ITF W15 Gimcheon | 2019/06/17 01:00 | Honoka Kobayashi v So Hee Jung | 2-6,7-5,11-9 |
| ITF W15 Gimcheon | 2019/06/11 01:00 | Honoka Kobayashi v Dayeon Back | 6-4,0-6,4-10 |
| ITF W15 Gimcheon | 2019/06/10 01:00 | Honoka Kobayashi v SinHee Kim | 6-3,6-1 |
| Full List | 2019/05/07 07:15 | Honoka Kobayashi v Diana Khodan | 4-6,5-7 |
| ITF W15 Antalya | 2019/05/04 07:45 | Indy De Vroome v Honoka Kobayashi | 6-3,2-6,6-2 |
| ITF W15 Antalya | 2019/05/03 07:45 | Daria Nazarkina v Honoka Kobayashi | 3-6,0-6 |
| ITF W15 Antalya | 2019/05/02 10:30 | Carmen Schultheiss v Honoka Kobayashi | 4-6,4-6 |