Stadium: COURT A Round: 25 Ground: Synthetic outdoor
| ITF Women Makinohara | 2018/10/08 02:45 | Ari Matsumoto v Sakura Hosogi | 7-5,6-1 |
| ITF Women Makinohara | 2018/10/07 03:00 | Ari Matsumoto v Yui Chikaraishi | 6-3,6-3 |
| ITF Women Kofu | 2018/06/13 02:45 | Ari Matsumoto v Kai-Chen Chang | 2-6,6-7 |
| ITF Women Karuizawa | 2018/05/24 02:40 | Miyabi Inoue v Ari Matsumoto | 6-4,6-2 |
| ITF Women Karuizawa | 2018/05/22 02:35 | Chisa Hosonuma v Ari Matsumoto | 5-7,2-6 |
| ITF Women Karuizawa Qual | 2018/05/21 01:00 | Alexandra Riley v Ari Matsumoto | 0-6,4-6 |
| ITF Women Kurume | 2018/05/16 01:00 | Rika Fujiwara v Ari Matsumoto | 3-6,6-3,6-4 |
| ITF Women Kurume Qual | 2018/05/15 01:00 | Yuki Kristina Chiang v Ari Matsumoto | 0-6,0-6 |
| ITF Women Obidos | 2018/10/02 11:30 | Miharu Imanishi v Gaia Sanesi | 5-7,6-7 |
| ITF Women Obidos | 2018/09/26 10:00 | Miharu Imanishi v Urszula Radwanska | 4-6,2-6 |
| WTA Tokyo | 2018/09/15 10:45 | Gabriela Dabrowski v Miharu Imanishi | 6-3,6-2 |
| WTA Hiroshima | 2018/09/09 07:40 | Urszula Radwanska v Miharu Imanishi | 7-6,6-1 |
| ITF Women Nanao | 2018/08/30 03:00 | Mai Hontama v Miharu Imanishi | 7-6,5-7,6-2 |
| ITF Women Nanao | 2018/08/29 03:30 | Megumi Nishimoto v Miharu Imanishi | 7-5,4-6,2-6 |
| ITF Women Tsukuba | 2018/08/22 03:20 | Mai Hontama v Miharu Imanishi | 6-1,6-0 |
| Wimbledon Women Qual | 2018/06/26 13:20 | Dalila Jakupovic v Miharu Imanishi | 6-2,6-2 |