Stadium: Court 8 Round: 54 Ground: Hardcourt outdoor
| ITF Women Makinohara | 2018/10/11 00:30 | Ayumi Koshiishi v Michika Ozeki | 2-6,0-6 |
| ITF Women Nonthaburi | 2018/08/05 04:15 | Michika Ozeki v Ayumi Koshiishi | 7-6,5-7,3-6 |
| ITF - Nonthaburi W25 | 2019/07/22 08:00 | Ho Ching Wu v Ayumi Koshiishi | 3-6,2-6 |
| ITF W15 Gimcheon | 2019/06/20 01:00 | Ayumi Koshiishi v Sunam Jeong | 2-6,6-7 |
| ITF W15 Gimcheon | 2019/06/19 01:00 | Ayumi Koshiishi v Honoka Kobayashi | 4-6,6-4,6-4 |
| 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 - Daegu W25 | 2019/06/04 01:00 | Ayumi Koshiishi v So-Ra Lee | 7-5,6-2 |
| ITF - Luzhou W25 | 2019/05/28 06:15 | Ayumi Koshiishi v Jessica Ho | 3-6,1-6 |
| ITF - Nonthaburi W25 | 2019/07/22 07:55 | Rada Manataweewat v Michika Ozeki | 0-6,3-6 |
| ITF W25 Qujing | 2019/07/17 05:00 | Aleksandrina Naydenova v Michika Ozeki | 6-3,6-3 |
| ITF W25 Qujing | 2019/07/16 02:00 | Michika Ozeki v Kanami Tsuji | 6-0,6-1 |
| ITF W60 Honolulu | 2019/07/10 20:00 | Deniz Khazaniuk v Michika Ozeki | 1-6,6-3,6-4 |
| ITF W60 Honolulu | 2019/07/09 21:55 | Abbie Myers v Michika Ozeki | 1-6,0-6 |
| ITF W60 Honolulu | 2019/07/08 22:10 | Salome Devidze v Michika Ozeki | 1-6,1-6 |
| ITF - Jakarta W15 | 2019/06/29 03:00 | Rifanty Kahfiani v Michika Ozeki | 6-3,6-4 |
| ITF - Jakarta W15 | 2019/06/28 02:00 | Yexin Ma v Michika Ozeki | 6-3,4-6,2-6 |