Stadium: Court 5 Round: 26 Ground: Synthetic outdoor
| ITF Women Karuizawa | 2018/05/24 01:15 | Mei Yamaguchi v Risa Ushijima | 3-6,7-5,7-6 |
| ITF Women Hamamatsu | 2018/10/17 01:00 | Risa Ushijima v Michika Ozeki | 6-3,2-6,6-3 |
| ITF Women Nanao | 2018/08/30 03:00 | Risa Ushijima v Himeno Sakatsume | 3-6,5-7 |
| ITF Women Nanao | 2018/08/29 06:05 | Momoko Kobori v Risa Ushijima | 5-7,2-6 |
| ITF Women Nanao | 2018/08/27 04:20 | Risa Ushijima v Ange Oby Kajuru | 7-5,6-2 |
| ITF Women Nanao | 2018/08/26 06:00 | Risa Ushijima v Michiru Furuya | 4-6,6-2,6-4 |
| ITF Women Tsukuba | 2018/08/23 03:30 | Xiyu Wang v Risa Ushijima | 6-4,6-1 |
| ITF Women Tsukuba | 2018/08/22 00:30 | Shiho Akita v Risa Ushijima | 2-6,2-6 |
| ITF Women Nonthaburi Qual | 2018/07/15 04:30 | Patcharin Cheapchandej v Risa Ushijima | 6-3,6-4 |
| ITF Women Hamamatsu | 2018/10/16 02:50 | Mei Yamaguchi v Hua-Chen Lee | 4-6,6-3,6-4 |
| ITF Women Makinohara | 2018/10/11 02:55 | Momoko Kobori v Mei Yamaguchi | 6-1,6-3 |
| ITF Women Makinohara | 2018/10/09 00:30 | Akari Inoue v Mei Yamaguchi | 0-6,1-6 |
| ITF Women Nonthaburi Qual | 2018/07/15 02:00 | Kaylah McPhee v Mei Yamaguchi | 6-2,6-3 |
| ITF Women Nonthaburi Qual | 2018/07/14 02:00 | Dolavee Tumthong v Mei Yamaguchi | 3-6,2-6 |
| ITF Women Nonthaburi Qual | 2018/07/08 03:10 | Mei Yamaguchi v Gabriella Da Silva Fick | 6-7,1-6 |
| ITF Women Nonthaburi Qual | 2018/07/07 04:00 | Mei Yamaguchi v Ramya Natarajan | 4-6,6-1,6-1 |
| ITF Women Kofu | 2018/06/13 02:40 | Misaki Doi v Mei Yamaguchi | 6-3,6-3 |