Stadium: Court 8 Round: 44
| ITF Women Daegu Qual | 2018/06/18 02:30 | Hosonuma, Chisa v Nor, Hoyeon | 7-6,6-3 |
| ITF Women Gyeongsan | 2018/06/13 05:55 | Hosonuma, Chisa v Jeong, Yeong Won | 4-6,3-6 |
| ITF Women Sangju | 2018/06/08 02:00 | Hosonuma, Chisa v Ho Ching Wu | 2-6,3-6 |
| ITF Women Sangju | 2018/06/07 01:00 | Yoshitomi, Aiko v Hosonuma, Chisa | 5-7,3-6 |
| ITF Women Sangju | 2018/06/06 03:25 | Hosonuma, Chisa v Ng, Kwan Yau | 2-6,6-1,6-3 |
| Karuizawa, Singles W-WITF-JPN-10A | 2018/05/22 02:35 | Hosonuma, Chisa v Matsumoto, Ari | 5-7,2-6 |
| ITF Women Kurume Qual | 2018/05/14 01:00 | Hosonuma, Chisa v Michika Ozeki | 6-7,2-6 |
| ITF Women Kurume Qual | 2018/05/13 00:30 | Hosonuma, Chisa v Naoko Eto | 6-0,6-0 |
| ITF Women Daegu Qual | 2018/06/18 02:00 | Koike, Satsuki v Mdlulwa, Warona | 6-0,6-0 |
| ITF Women Daegu Qual | 2018/06/17 01:00 | Koike, Satsuki v Lee, SE Jin | 6-3,6-0 |
| ITF Women Gyeongsan | 2018/06/16 01:00 | Hanna Chang v Koike, Satsuki | 6-2,6-4 |
| ITF Women Gyeongsan | 2018/06/15 02:40 | Koike, Satsuki v Zhibek Kulambayeva | 5-7,6-3,7-6 |
| ITF Women Gyeongsan | 2018/06/14 04:50 | Eunhye Lee v Koike, Satsuki | 4-6,2-6 |
| ITF Women Gyeongsan | 2018/06/13 03:40 | Bizhukova, Fatima v Koike, Satsuki | 2-6,6-2,1-6 |
| ITF Women Gyeongsan Qual | 2018/06/12 04:50 | Yoon, Sujin v Koike, Satsuki | 4-6,2-6 |
| ITF Women Gyeongsan Qual | 2018/06/11 02:00 | Koike, Satsuki v Miyahara, Mihoki | 6-2,6-2 |