Stadium: Court G Round: 45 Ground: Hardcourt outdoor
| Nishi-Tama, Simples W-ITF-JPN-04A | 2019/03/11 06:00 | Moyuka Uchijima v Honoka Kobayashi | 6-7,2-6 |
| ITF W25 Yokohama | 2019/03/04 07:30 | Myers, Abbie v Honoka Kobayashi | 6-0,6-4 |
| Osaka, Singles W-ITF-JPN-02A | 2019/02/25 01:00 | Ulrikke Eikeri v Honoka Kobayashi | 6-4,3-6,10-7 |
| ITF - W15 Antalya | 2019/01/25 09:25 | Honoka Kobayashi v Viktoriia Dema | 6-2,6-4 |
| ITF - W15 Antalya | 2019/01/23 07:00 | Honoka Kobayashi v Kong, Qianxin | 6-3,6-2 |
| ITF - W15 Antalya | 2019/01/22 11:00 | Jessica Marmorstein v Honoka Kobayashi | 0-6,0-6 |
| ITF - W15 Antalya | 2019/01/17 09:00 | Honoka Kobayashi v Vlada Ekshibarova | 2-6,3-6 |
| ITF - W15 Antalya | 2019/01/16 12:10 | Honoka Kobayashi v Giulia Carbonaro | 7-5,6-2 |
| Nishi-Tama, Simples W-ITF-JPN-04A | 2019/03/11 06:00 | Catherine Harrison v Fernandez, Leylah Annie | 6-2,6-7,12-10 |
| ITF W25 Yokohama | 2019/03/09 04:10 | Catherine Harrison v Greet Minnen | 1-6,3-6 |
| ITF W25 Yokohama | 2019/03/08 04:20 | Catherine Harrison v Lee, Hua-Chen | 7-5,6-2 |
| ITF W25 Yokohama | 2019/03/07 02:50 | Rutuja Bhosale v Catherine Harrison | 2-6,1-6 |
| ITF W25 Yokohama | 2019/03/06 01:30 | Catherine Harrison v Luangnam, Nudnida | 6-0,7-6 |
| ITF W25 Yokohama | 2019/03/05 01:30 | Choi, Ji-Hee v Catherine Harrison | 3-6,3-6 |
| ITF W25 Yokohama | 2019/03/04 03:25 | Catherine Harrison v Mana Ayukawa | 6-2,7-6 |
| Surprise, Singles W-ITF-USA-04A | 2019/02/11 16:00 | Catherine Harrison v Maegan Manasse | 2-6,2-6 |