Stadium: Court B1 Round: 54 Ground: Hardcourt outdoor
| Gimcheon, Singles Qualifying W-ITF-KOR-05A | 2019/06/18 01:00 | Hosonuma, Chisa v Lee, Jeongyun | 2-6,4-6 |
| Gimcheon, Singles Qualifying W-ITF-KOR-05A | 2019/06/17 01:00 | Hosonuma, Chisa v Kim, S. | 6-3,6-3 |
| Karuizawa, Singles W-ITF-JPN-12A | 2019/05/21 04:30 | Kanako Morisaki v Hosonuma, Chisa | 6-3,6-2 |
| Karuizawa, Singles W-ITF-JPN-12A | 2019/05/20 01:00 | Nishizato, Kiko v Hosonuma, Chisa | 1-6,4-6 |
| Kurume, Singles W-ITF-JPN-11A | 2019/05/13 01:55 | Hosonuma, Chisa v Ena Shibahara | 2-6,3-6 |
| ITF W15 Cancun | 2019/03/19 19:00 | Magali Kempen v Hosonuma, Chisa | 6-3,6-2 |
| ITF W15 Cancun | 2019/03/16 13:30 | Maria Camila Osorio Serrano v Hosonuma, Chisa | 6-3,6-1 |
| ITF W15 Cancun | 2019/03/15 13:00 | Hosonuma, Chisa v Weedon, Kirsten-Andrea | 6-4,6-2 |
| Hua Hin, Simples W-ITF-THA-10A | 2019/07/09 02:30 | Kobayashi, Honoka v Lunda Kumhom | 2-6,2-6 |
| Hua Hin, Simples W-ITF-THA-10A | 2019/07/08 03:25 | Kobayashi, Honoka v Kanaphuet, Thitirat | 6-0,6-0 |
| Hua Hin, Simples W-ITF-THA-10A | 2019/07/03 04:00 | Kim, Da Hye v Kobayashi, Honoka | 6-3,6-4 |
| Hua Hin, Simples W-ITF-THA-10A | 2019/07/02 03:00 | Kobayashi, Honoka v Liu, Mingyang | 6-3,6-0 |
| Hua Hin, Simples W-ITF-THA-10A | 2019/07/01 03:00 | Kobayashi, Honoka v Pang, Sarah | 6-0,6-0 |
| Gimcheon, Singles Qualifying W-ITF-KOR-05A | 2019/06/19 01:00 | Ayumi Koshiishi v Kobayashi, Honoka | 4-6,6-4,6-4 |
| Gimcheon, Singles Qualifying W-ITF-KOR-05A | 2019/06/18 01:00 | Kobayashi, Honoka v Takayama, Chihiro | 6-1,6-1 |
| Gimcheon, Singles Qualifying W-ITF-KOR-05A | 2019/06/17 01:00 | Kobayashi, Honoka v Jung, So Hee | 2-6,7-5,11-9 |