Stadium: Court C Round: 25
| ITF Women Taipei | 2018/07/23 03:00 | Yi Tsen Cho v Kanako Osafune | 3-6,6-2,7-6 |
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/06/09 04:00 | Hikaru Sato v Kanako Osafune | 6-3,6-2 |
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/06/09 00:00 | Sumire Ri v Kanako Osafune | 4-6,1-6 |
| Sharm El Sheikh, Singles W-WITF-EGY-09A | 2018/04/08 08:00 | Milkova, Barbora v Kanako Osafune | 6-3,6-2 |
| Sharm El Sheikh, Singles W-WITF-EGY-09A | 2018/04/01 08:00 | Milkova, Barbora v Kanako Osafune | 6-4,6-3 |
| Sharm El Sheikh, Singles W-WITF-EGY-09A | 2018/03/26 08:00 | Kanako Osafune v Kalva, Bhuvana | 2-6,4-6 |
| Sharm El Sheikh, Singles W-WITF-EGY-09A | 2018/03/25 10:30 | Patrascu, Maria v Kanako Osafune | 4-6,3-6 |
| Nishi-Tama, Singles W-WITF-JPN-01A | 2018/03/17 03:00 | Kanako Osafune v Iwai, Mayu | 3-6,5-7 |
| Tsukuba, Singles W-WITF-JPN-09A | 2018/08/19 00:30 | Nagi Hanatani v Kawasaki, Mitsumi | 6-3,6-3 |
| Nonthaburi, Simples W-WITF-THA-09A | 2018/08/05 02:00 | Dabin Kim v Kawasaki, Mitsumi | 7-6,6-3 |
| Nonthaburi, Simples W-WITF-THA-09A | 2018/08/04 02:00 | Kawasaki, Mitsumi v Lisa-Marie Rioux | 7-5,6-4 |
| ITF Women Taipei | 2018/07/25 05:30 | Ng, Kwan Yau v Kawasaki, Mitsumi | 6-4,6-4 |
| ITF Women Hong Kong | 2018/07/09 05:55 | Reina Takahashi v Kawasaki, Mitsumi | 6-0,7-5 |
| Kofu, Singles W-WITF-JPN-02A | 2018/06/12 01:00 | Tanaka, Yuuki v Kawasaki, Mitsumi | 6-0,6-2 |
| ITF Women Karuizawa Qual | 2018/05/21 01:00 | Kawasaki, Mitsumi v Rina Saigo | 1-6,2-6 |
| ITF Women Karuizawa Qual | 2018/05/20 02:30 | Kawasaki, Mitsumi v Akiyama, Minami | 6-3,6-3 |