Stadium: Court 8 Round: 19 Ground: Hardcourt outdoor
| ITF - W15 - Monastir | 2021/07/22 10:20 | Ayumi Koshiishi v Katarina Kozarov | 6-2,6-1 |
| ITF W25 - Kofu | 2023/03/29 00:30 | Katarina Kozarov v Haruka Kaji | 6-7,3-6 |
| ITF W25 - Kofu | 2023/03/28 07:05 | Katarina Kozarov v Yu-Yun Li | 6-2,6-1 |
| ITF W25 - Kofu | 2023/03/28 00:30 | Katarina Kozarov v Anri Nagata | 6-0,6-3 |
| ITF W25 - Jakarta | 2023/03/21 02:00 | Haruna Arakawa v Katarina Kozarov | 6-4,2-6,2-10 |
| ITF W25 - Jakarta | 2023/03/20 02:00 | Margot Phanthala v Katarina Kozarov | 2-6,1-6 |
| ITF W25 - Fredericton | 2023/03/09 14:55 | Katarina Kozarov v Jamie Loeb | 7-6,3-6,2-6 |
| ITF W25 - Fredericton | 2023/03/08 14:55 | Katarina Kozarov v Anna-Raphaelle Serghi | 6-1,6-3 |
| ITF W25 - Toronto | 2023/02/28 15:00 | Olivia Lincer v Katarina Kozarov | 3-6,6-3,6-3 |
| ITF W25 - Kofu | 2023/03/29 04:20 | Ayumi Koshiishi v Eri Hozumi | 4-6,2-6 |
| ITF W15 - Hinode | 2023/03/26 00:30 | Natsumi Kawaguchi v Ayumi Koshiishi | 6-1,6-2 |
| ITF W15 - Hinode | 2023/03/24 00:00 | Yuka Hosoki v Ayumi Koshiishi | 7-5,2-6,0-6 |
| ITF W15 - Hinode | 2023/03/23 02:35 | Chisa Hosonuma v Ayumi Koshiishi | 2-6,1-6 |
| ITF W15 - Hinode | 2023/03/22 01:00 | Momoko Nishio v Ayumi Koshiishi | 4-6,6-7 |
| ITF W15 - Kuching | 2023/03/05 01:30 | Hanyu Guo v Ayumi Koshiishi | 7-5,2-6,1-6 |
| ITF W15 - Kuching | 2023/03/04 01:30 | Shuo Feng v Ayumi Koshiishi | 0-6,1-6 |
| ITF W15 - Kuching | 2023/03/03 01:30 | Ayumi Koshiishi v Aoi Ito | 6-1,7-6 |