Stadium: Court 2 Round: 25 Ground: Hardcourt outdoor
| Kyoto, Qualifications Simples W-ITF-JPN-15A | 2019/09/05 05:30 | Ayumi Koshiishi v Michika Ozeki | 0-6,3-6 |
| Kyoto, Qualifications Simples W-ITF-JPN-15A | 2019/09/04 04:25 | Imanishi, Miharu v Ayumi Koshiishi | 3-6,4-6 |
| Kyoto, Qualifications Simples W-ITF-JPN-15A | 2019/09/02 04:00 | Ayumi Koshiishi v Kishigami, Utaka | 7-5,7-6 |
| Kyoto, Qualifications Simples W-ITF-JPN-15A | 2019/09/02 00:00 | Ayumi Koshiishi v Tan, Hx Isabella | 6-0,6-1 |
| ITF W25 Nanao | 2019/08/27 01:00 | Ayumi Koshiishi v Anri Nagata | 4-6,0-6 |
| Tsukuba, Singles W-ITF-JPN-13A | 2019/08/19 00:30 | Yui Chikaraishi v Ayumi Koshiishi | 2-6,6-2,10-7 |
| Nonthaburi, Singles W-ITF-THA-01A | 2019/07/30 02:30 | Yidi Yang v Ayumi Koshiishi | 6-0,6-2 |
| Nonthaburi, Singles W-ITF-THA-01A | 2019/07/29 06:20 | Thasaporn Naklo v Ayumi Koshiishi | 3-6,4-6 |
| Nonthaburi, Singles W-ITF-THA-01A | 2019/08/03 03:00 | Yuki Naito v Mananchaya Sawangkaew | 6-3,6-4 |
| Nonthaburi, Singles W-ITF-THA-01A | 2019/08/02 03:00 | Mananchaya Sawangkaew v Rutuja Bhosale | 6-1,6-4 |
| Nonthaburi, Singles W-ITF-THA-01A | 2019/08/01 02:30 | Mananchaya Sawangkaew v Eudice Chong | 6-2,6-2 |
| Nonthaburi, Singles W-ITF-THA-01A | 2019/07/30 04:05 | Eunhye Lee v Mananchaya Sawangkaew | 2-6,2-6 |
| Nonthaburi, Singles W-ITF-THA-01A | 2019/07/29 05:00 | Buayam, Kamonwan v Mananchaya Sawangkaew | 3-6,2-6 |
| Nonthaburi, Singles W-ITF-THA-01A | 2019/07/25 02:30 | Sharipova, Sabina v Mananchaya Sawangkaew | 6-4,6-4 |
| Nonthaburi, Singles W-ITF-THA-01A | 2019/07/24 02:00 | Mananchaya Sawangkaew v Choi, Ji-Hee | 5-7,6-2,6-1 |
| Nonthaburi, Singles W-ITF-THA-01A | 2019/07/23 03:55 | Chang, Kai-Chen v Mananchaya Sawangkaew | 2-6,5-7 |