Stadium: Court 2 Round: 25 Ground: Hardcourt outdoor
| Kofu, Singles Qualifying W-WITF-JPN-02A | 2018/06/10 01:30 | Friant, Eimi v Shiori Fukuda | 1-6,0-6 |
| ITF Women Singapore | 2018/06/06 02:00 | Jovic, J. v Ushijima, Risa | 6-2,7-5 |
| ITF Women Singapore | 2018/06/05 02:00 | Ushijima, Risa v Aldila Sutjiadi | 7-5,6-2 |
| Karuizawa, Singles W-WITF-JPN-10A | 2018/05/24 01:15 | Mei Yamaguchi v Ushijima, Risa | 3-6,7-5,7-6 |
| ITF Women Kurume | 2018/05/15 02:40 | Olivia Tjandramulia v Ushijima, Risa | 6-2,2-6,6-4 |
| ITF Women Osaka | 2018/04/11 02:45 | Ushijima, Risa v En Shuo Liang | 1-6,4-6 |
| ITF Women Osaka Qual | 2018/04/09 01:00 | Kajuru, Ange Oby v Ushijima, Risa | 3-6,2-6 |
| ITF Women Osaka Qual | 2018/04/08 02:00 | Mayuka Aikawa v Ushijima, Risa | 4-6,1-6 |
| ITF Women Kashiwa Qual | 2018/04/01 00:30 | Karman Kaur Thandi v Ushijima, Risa | 6-3,6-1 |