Estádio: Court 3 Round: 27 Ground: Hardcourt outdoor
| ITF - M15 Tay Ninh | 2022/06/07 02:00 | Seita Watanabe v Masamichi Imamura | 3-6,1-6 |
| ITF - M15 Yanagawa | 2023/12/21 01:00 | Linang Xiao v Masamichi Imamura | 4-6,4-6 |
| ITF - M15 Yanagawa | 2023/12/20 05:00 | Hanyi Liu v Masamichi Imamura | 6-7,3-6 |
| Challenger - Yokkaichi | 2023/11/26 02:35 | Masamichi Imamura v Andres Martin | 4-6,6-7 |
| Challenger - Yokohama | 2023/11/21 02:30 | Yasutaka Uchiyama v Masamichi Imamura | 6-1,6-1 |
| ITF - M15 Jacarta | 2023/01/26 02:30 | Wishaya Trongcharoenchaikul v Masamichi Imamura | 6-1,6-0 |
| ITF - M15 Jacarta | 2023/01/25 06:30 | Masamichi Imamura v Ray Ho | 6-4,6-1 |
| ITF - M15 Jacarta | 2023/01/18 06:25 | Boris Butulija v Masamichi Imamura | 6-4,6-4 |
| Challenger - Yokkaichi | 2022/11/20 02:55 | Jason Jung v Masamichi Imamura | 6-4,6-3 |
| ITF - M15 Yanagawa | 2023/12/21 03:55 | Seita Watanabe v Shu Matsuoka | 7-5,6-4 |
| ITF - M15 Yanagawa | 2023/12/20 02:30 | Seita Watanabe v Hayato Matsuoka | 7-5,6-2 |
| ITF - M25 Kalaburagi | 2023/12/01 04:00 | David Pichler v Seita Watanabe | 6-2,6-0 |
| ITF - M25 Kalaburagi | 2023/11/30 07:45 | Seita Watanabe v Rishi Reddy | 6-2,6-3 |
| ITF - M25 Mumbai | 2023/11/22 03:30 | Seita Watanabe v Louis Wessels | 4-6,5-7 |
| ITF - M25 Takasaki | 2023/09/20 01:00 | Naoki Nakagawa v Seita Watanabe | 6-3,6-2 |
| ITF - M25 Takasaki | 2023/09/18 03:30 | Mitsuki Wei Kang Leong v Seita Watanabe | 4-6,4-6 |
| ITF - M25 Sapporo | 2023/09/15 00:55 | Naoki Nakagawa v Seita Watanabe | 6-3,6-2 |