Stadion: Court 6 Round: 25 Ground: Synthetic outdoor
| ITF Damen - Hua Hin | 2017/07/19 03:00 | Michika Ozeki v Risa Ushijima | 1-6,6-7 |
| ITF Damen - Tokyo - Qualifikation | 2017/06/05 03:55 | Risa Ushijima v Michika Ozeki | 6-4,6-4 |
| ITF Damen - Kurume | 2017/05/16 01:00 | Michika Ozeki v Risa Ushijima | 3-6,3-6 |
| ITF Damen - Nanao | 2018/08/30 03:00 | Risa Ushijima v Himeno Sakatsume | 3-6,5-7 |
| ITF Damen - Nanao | 2018/08/29 06:05 | Momoko Kobori v Risa Ushijima | 5-7,2-6 |
| ITF Damen - Nanao | 2018/08/27 04:20 | Risa Ushijima v Ange Oby Kajuru | 7-5,6-2 |
| ITF Damen - Nanao | 2018/08/26 06:00 | Risa Ushijima v Michiru Furuya | 4-6,6-2,6-4 |
| ITF Damen - Tsukuba | 2018/08/23 03:30 | Xiyu Wang v Risa Ushijima | 6-4,6-1 |
| ITF Damen - Tsukuba | 2018/08/22 00:30 | Shiho Akita v Risa Ushijima | 2-6,2-6 |
| ITF Damen - Nonthaburi - Qualifikation | 2018/07/15 04:30 | Patcharin Cheapchandej v Risa Ushijima | 6-3,6-4 |
| ITF Damen - Nonthaburi - Qualifikation | 2018/07/14 06:25 | Rada Manataweewat v Risa Ushijima | 2-6,1-6 |
| ITF Damen - Makinohara | 2018/10/12 01:00 | Ayumi Miyamoto v Michika Ozeki | 6-4,7-6 |
| ITF Damen - Makinohara | 2018/10/11 00:30 | Ayumi Koshiishi v Michika Ozeki | 2-6,0-6 |
| ITF Damen - Makinohara | 2018/10/10 00:30 | Michika Ozeki v Emily Appleton | 6-3,6-3 |
| ITF Women Kyoto | 2018/09/07 03:30 | Haruna Arakawa v Michika Ozeki | 6-3,6-3 |
| ITF Women Kyoto | 2018/09/06 01:00 | Michika Ozeki v Chie Kezuka | 6-0,6-4 |
| ITF Women Kyoto | 2018/09/05 06:00 | Michika Ozeki v Ayumi Miyamoto | 6-1,6-2 |
| ITF Women Kyoto | 2018/09/04 04:45 | Michika Ozeki v Ayaka Ozeki | 6-2,6-1 |
| ITF Damen - Nanao | 2018/08/28 03:00 | Himeno Sakatsume v Michika Ozeki | 6-2,6-7,6-4 |