Stadium: Court 8 Round: 54 Ground: Hardcourt outdoor
| Makinohara, Singles Qualifying W-WITF-JPN-15A | 2018/10/11 00:30 | Ayumi Koshiishi v Michika Ozeki | 2-6,0-6 |
| Nonthaburi, Simples W-WITF-THA-09A | 2018/08/05 04:15 | Michika Ozeki v Ayumi Koshiishi | 7-6,5-7,3-6 |
| Nonthaburi, Singles W-ITF-THA-01A | 2019/07/22 08:00 | Ho Ching Wu v Ayumi Koshiishi | 3-6,2-6 |
| Gimcheon, Singles Qualifying W-ITF-KOR-05A | 2019/06/20 01:00 | Ayumi Koshiishi v Jeong, Sunam | 2-6,6-7 |
| Gimcheon, Singles Qualifying W-ITF-KOR-05A | 2019/06/19 01:00 | Ayumi Koshiishi v Honoka Kobayashi | 4-6,6-4,6-4 |
| Gimcheon, Singles Qualifying W-ITF-KOR-05A | 2019/06/14 02:00 | Ayumi Koshiishi v Misaki Matsuda | 5-7,7-6,3-6 |
| Gimcheon, Singles Qualifying W-ITF-KOR-05A | 2019/06/13 01:30 | Ayumi Koshiishi v Mu, Shou Na | 7-5,6-3 |
| Gimcheon, Singles Qualifying W-ITF-KOR-05A | 2019/06/12 01:00 | Ayumi Koshiishi v Dayeon Back | 7-5,6-2 |
| Daegu, Singles W-ITF-KOR-04A | 2019/06/04 01:00 | Ayumi Koshiishi v Lee, So-Ra | 7-5,6-2 |
| Luzhou, Simples W-ITF-CHN-09A | 2019/05/28 06:15 | Ayumi Koshiishi v Ho, Jessica | 3-6,1-6 |
| Nonthaburi, Singles W-ITF-THA-01A | 2019/07/22 07:55 | Rada Manataweewat v Michika Ozeki | 0-6,3-6 |
| Qujing, Simples W-ITF-CHN-15A | 2019/07/17 05:00 | Naydenova, Aleksandrina v Michika Ozeki | 6-3,6-3 |
| Qujing, Simples W-ITF-CHN-15A | 2019/07/16 02:00 | Michika Ozeki v Kanami Tsuji | 6-0,6-1 |
| Honolulu, Simples W-ITF-USA-20A | 2019/07/10 20:00 | Khazaniuk, Deniz v Michika Ozeki | 1-6,6-3,6-4 |
| Honolulu, Simples W-ITF-USA-20A | 2019/07/09 21:55 | Myers, Abbie v Michika Ozeki | 1-6,0-6 |
| Honolulu, Simples W-ITF-USA-20A | 2019/07/08 22:10 | Devidze, Salome v Michika Ozeki | 1-6,1-6 |
| Jakarta, Singles W-ITF-INA-02A | 2019/06/29 03:00 | Kahfiani, Rifanty v Michika Ozeki | 6-3,6-4 |
| Jakarta, Singles W-ITF-INA-02A | 2019/06/28 02:00 | Yexin Ma v Michika Ozeki | 6-3,4-6,2-6 |