Stadium: Court 12 Round: 25 Ground: Hardcourt outdoor
| ITF Women Singapore Qual | 2018/06/10 02:00 | Deria Nur Haliza v Ayumi Koshiishi | 1-6,6-4,6-3 |
| ITF Women Singapore | 2018/06/04 02:00 | Ayumi Koshiishi v Hiroko Kuwata | 6-7,7-6,4-6 |
| ITF Women Singapore Qual | 2018/06/03 03:20 | Ayumi Koshiishi v Khee Yen Wee | 6-3,6-1 |
| ITF Women Singapore Qual | 2018/06/02 04:00 | Ayumi Koshiishi v Sarah Pang | 6-0,6-0 |
| ITF Women Changwon | 2018/05/24 02:40 | Ayumi Koshiishi v Ya-Hsuan Lee | 4-6,3-6 |
| ITF Women Changwon | 2018/05/23 04:25 | Ayumi Koshiishi v Dabin Kim | 6-1,6-3 |
| ITF Women Changwon Qual | 2018/05/22 04:05 | Chang Liu v Ayumi Koshiishi | 1-6,3-6 |
| ITF Women Incheon | 2018/05/16 01:30 | Na-Lae Han v Ayumi Koshiishi | 6-1,6-7,6-2 |
| ITF Women Daegu Qual | 2018/06/18 03:30 | Sang Hee Park v Haine Ogata | 6-2,6-1 |
| ITF Women Daegu Qual | 2018/06/17 02:00 | So-Hee Yoon v Haine Ogata | 3-6,1-6 |
| ITF Women Gyeongsan | 2018/06/14 03:45 | Haine Ogata v Ho Ching Wu | 3-6,6-7 |
| ITF Women Gyeongsan | 2018/06/13 01:00 | Josephine Boualem v Haine Ogata | 6-3,2-6,2-6 |
| ITF Women Gyeongsan Qual | 2018/06/12 04:00 | Ah Song v Haine Ogata | 5-7,4-6 |
| ITF Women Kurume Qual | 2018/05/13 06:55 | Ange Oby Kajuru v Haine Ogata | 6-3,1-6,6-4 |
| ITF Women Cairo | 2018/05/10 07:30 | Gergana Topalova v Haine Ogata | 6-4,6-1 |
| ITF Women Cairo | 2018/05/09 11:25 | Haine Ogata v Sem Wensveen | 6-0,6-3 |