| Challenger Kyoto Qual | 2018/02/18 01:00 | Zhe Li v Kosuke Shibano | 6-4,6-4 |
| Challenger Kyoto Qual | 2018/02/17 01:00 | Keisuke Watanuki v Kosuke Shibano | 4-6,4-6 |
| UTR Pro Miki | 2023/02/08 03:30 | Ryohei Takase v Seita Watanabe | 2-6,1-5 |
| UTR Pro Miki | 2023/02/06 03:30 | Ryotaro Taguchi v Seita Watanabe | 6-2,6-7,7-6 |
| Challenger Kobe | 2022/11/13 01:00 | Mukund Sasikumar v Seita Watanabe | 6-3,6-1 |
| ITF M25 Jakarta | 2022/10/27 02:00 | Thomas Fancutt v Seita Watanabe | 7-5,7-5 |
| ITF M25 Jakarta | 2022/10/26 04:20 | Congsup Congcar v Seita Watanabe | 2-6,2-6 |
| Challenger Busan | 2022/10/16 01:30 | Max Purcell v Seita Watanabe | 6-0,6-2 |
| Challenger Seoul | 2022/10/09 05:25 | Hiroki Moriya v Seita Watanabe | 6-3,6-2 |
| Challenger Gwangju | 2022/10/03 04:00 | Yunseong Chung v Seita Watanabe | 6-2,7-6 |