Stadium: Court 8 Round: 62 Ground: Hardcourt outdoor
| ITF Women Nishi-Tama | 2018/03/17 04:00 | Kei Kato v Ayumi Koshiishi | 7-5,6-4 |
| ITF Women Toyota Qual | 2018/03/10 01:00 | Ji-Hee Choi v Ayumi Koshiishi | 4-6,6-3,6-2 |
| ITF Women Hong Kong | 2018/01/01 03:35 | Risa Ushijima v Ayumi Koshiishi | 6-1,3-6,7-5 |
| ITF Women Hong Kong | 2017/12/31 02:00 | Ayumi Koshiishi v Pinyi Zuo | 6-1,6-0 |
| ITF Women Hong Kong | 2017/12/30 05:30 | Ayumi Koshiishi v Ashmitha Easwaramurthi | 6-0,6-2 |
| ITF Women Hong Kong | 2017/12/27 03:30 | Ayumi Koshiishi v Ling Zhang | 4-6,3-6 |
| ITF Women Hong Kong | 2017/12/25 04:45 | Ayumi Koshiishi v Yuqi Sheng | 7-6,6-2 |
| ITF Women Hong Kong | 2017/12/24 02:00 | Ayumi Koshiishi v Dariya Detkovskaya | 7-5,6-2 |
| ITF Women Nishi-Tama | 2018/03/20 04:50 | Haruna Arakawa v Kanako Morisaki | 5-7,2-6 |
| ITF Women Toyota Qual | 2018/03/10 03:00 | Miyabi Inoue v Haruna Arakawa | 6-3,6-0 |
| ITF Women Yokohama Qual | 2018/03/04 05:30 | Katherine Sebov v Haruna Arakawa | 6-1,7-6 |
| ITF Women Antalya | 2018/02/15 08:35 | Haruna Arakawa v Rebecca Marino | 1-6,3-6 |
| ITF Women Antalya | 2018/02/07 08:30 | Raluca Georgiana Serban v Haruna Arakawa | 6-4,6-1 |
| ITF Women Antalya | 2018/01/30 07:30 | Natalia Vajdova v Haruna Arakawa | 6-2,6-3 |
| ITF Women Navi Mumbai Qual | 2017/12/16 07:55 | Jacqueline Cabaj Awad v Haruna Arakawa | 5-7,2-6 |
| ITF Women Pune Qual | 2017/12/10 08:20 | Haruna Arakawa v Elena Bogdan | 1-6,1-6 |