Stadium: Court 8 Round: 54 Ground: Hardcourt outdoor
| ITF - W100 Tokyo | 2019/11/11 01:00 | Mai Hontama v Kozaki, Mio | 6-0,6-0 |
| ITF W15 Yeongwol | 2019/09/04 05:05 | Kozaki, Mio v Park, Eunyeong | 3-6,2-6 |
| ITF W15 Yeongwol | 2019/08/27 05:55 | Kozaki, Mio v Momkoonthod, Tamachan | 0-6,0-6 |
| Tsukuba, Singles W-ITF-JPN-13A | 2019/08/19 03:15 | Hsieh, Yu-Ting v Kozaki, Mio | 6-2,6-3 |
| Taipei, Singles W-ITF-TPE-01A | 2019/07/29 02:00 | Kozaki, Mio v Hsieh, Yu-Ting | 1-6,3-6 |
| Hua Hin, Simples W-ITF-THA-10A | 2019/07/10 03:00 | Kozaki, Mio v Feder, Ambre | 6-1,3-6,2-6 |
| Hua Hin, Simples W-ITF-THA-10A | 2019/07/02 04:25 | Mana Kawamura v Kozaki, Mio | 6-3,6-2 |
| Jakarta, Singles W-ITF-INA-02A | 2019/06/27 02:30 | Arianne Hartono v Kozaki, Mio | 6-1,6-1 |
| Hong Kong, Simples W-ITF-HKG-01B | 2020/01/02 02:00 | Lin Zhu v Mei Yamaguchi | 6-0,6-2 |
| Hong Kong, Simples W-ITF-HKG-01B | 2020/01/01 04:55 | Mei Yamaguchi v Hradecka, Lucie | 6-3,3-6,7-5 |
| Hong Kong, Simples W-ITF-HKG-01B | 2019/12/31 02:00 | Yexin Ma v Mei Yamaguchi | 2-6,7-6,5-10 |
| Hong Kong, Simples W-ITF-HKG-01B | 2019/12/30 03:00 | Mei Yamaguchi v Zhibek Kulambayeva | 6-2,6-0 |
| ITF W25 Hua Hin | 2019/11/13 03:00 | Mei Yamaguchi v Tere-Apisah, Abigail | 3-6,5-7 |
| ITF W25 Hua Hin | 2019/11/12 04:40 | Mei Yamaguchi v Punnin Kovapitukted | 6-2,6-4 |
| ITF W25 Hua Hin | 2019/11/11 05:45 | Mei Yamaguchi v Jang, Eun SE | 6-1,6-3 |
| ITF W25 Hua Hin | 2019/11/04 08:15 | Okuno, Ayaka v Mei Yamaguchi | 7-5,6-1 |