Stadium: Court 1 Round: 26 Ground: Hardcourt outdoor
| ITF M25 Taipei | 2019/07/23 02:00 | Taisei Ichikawa v Seita Watanabe | 5-7,4-6 |
| ITF M25 Takasaki | 2024/09/18 01:00 | Makoto Ochi v Taisei Ichikawa | 3-6,6-7 |
| ITF M25 Takasaki | 2024/09/16 02:30 | Taisei Ichikawa v Hien Q H Pham | 7-6,6-4 |
| ITF M25 Takasaki | 2024/09/15 07:00 | Taisei Ichikawa v Yuhei Kono | 6-3,6-0 |
| ITF M25 Sapporo | 2024/09/10 02:30 | Taisei Ichikawa v Naoki Tajima | 6-3,2-6,1-6 |
| ITF M25 Sapporo | 2024/09/04 02:50 | Ryotaro Matsumura v Taisei Ichikawa | 2-6,7-5,6-4 |
| ITF M25 Nakhon Si Thammarat | 2024/09/01 02:00 | Leo Borg v Taisei Ichikawa | 6-4,6-7,6-3 |
| ITF M25 Nakhon Si Thammarat | 2024/08/31 01:55 | Nam Hoang Ly v Taisei Ichikawa | 1-6,4-6 |
| ITF M25 Nakhon Si Thammarat | 2024/08/30 04:20 | Nick Chappell v Taisei Ichikawa | 4-6,4-6 |
| ITF M25 Takasaki | 2024/09/17 00:50 | Ryusuke Horiuchi v Seita Watanabe | 5-7,6-7 |
| ITF M25 Takasaki | 2024/09/16 00:55 | Seita Watanabe v Yuta Tomida | 6-7,6-3,10-7 |
| ITF M25 Takasaki | 2024/09/15 01:00 | Seita Watanabe v Shunrou Takeshima | 6-3,1-6,10-5 |
| Challenger Guangzhou | 2024/09/08 02:00 | Pengyu Lu v Seita Watanabe | 7-5,6-3 |
| Challenger Zhangjiagang | 2024/08/25 03:00 | Kris Van Wyk v Seita Watanabe | 6-3,6-3 |
| Challenger Jinan | 2024/08/18 10:35 | Keegan Smith v Seita Watanabe | 6-4,6-2 |
| Challenger Astana | 2024/07/17 06:40 | Aleksandre Bakshi v Seita Watanabe | 6-3,6-1 |
| Challenger Astana | 2024/07/16 07:15 | Filip Peliwo v Seita Watanabe | 7-6,4-6,6-7 |