Stadium: Center A Round: 26 Ground: Hardcourt outdoor
| ITF M25 Sapporo | 2023/09/13 01:00 | Naoki Nakagawa v Yusuke Kusuhara | 6-2,7-6 |
| ITF M25 Sapporo | 2023/09/09 02:00 | Naoki Nakagawa v Shuichi Sekiguchi | 7-5,3-6,5-7 |
| ITF M25 Sapporo | 2023/09/08 01:00 | Naoki Nakagawa v Kokoro Isomura | 6-2,6-0 |
| ITF M25 Sapporo | 2023/09/07 00:55 | Naoki Nakagawa v Shunsuke Wakita | 4-6,6-2,6-0 |
| ITF M25 Sapporo | 2023/09/06 01:00 | Naoki Nakagawa v Naoya Honda | 7-6,6-4 |
| ITF M25 Hong Kong | 2023/09/03 02:00 | Naoki Nakagawa v Adam Moundir | 2-6,6-4,6-10 |
| ITF M25 Hong Kong | 2023/08/31 02:00 | Naoki Nakagawa v Keisuke Saitoh | 6-4,6-7,6-1 |
| ITF M25 Hong Kong | 2023/08/30 03:50 | Naoki Nakagawa v Hong Kit Wong | 7-6,6-3 |
| ITF M25 Sapporo | 2023/09/13 03:00 | Seita Watanabe v Yuta Kikuchi | 6-1,6-3 |
| ITF M25 Sapporo | 2023/09/06 03:35 | Seita Watanabe v Tatsuma Ito | 6-4,4-6,4-6 |
| ITF M25 Tainan | 2023/08/23 04:20 | Ergi Kirkin v Seita Watanabe | 4-6,7-6,6-3 |
| ITF M25 Tainan | 2023/08/15 02:00 | Seita Watanabe v Takuya Kumasaka | 3-6,6-4,2-6 |
| ITF M25 Astana | 2023/08/03 10:50 | Khumoyun Sultanov v Seita Watanabe | 4-6,6-3,7-5 |
| ITF M25 Astana | 2023/08/02 10:25 | Seita Watanabe v Timur Maulenov | 3-6,6-3,6-2 |
| ITF M25 Astana | 2023/08/01 05:20 | Seita Watanabe v Mykhailo Mossur | 6-4,6-3 |
| ITF M25 Astana | 2023/07/31 05:40 | Seita Watanabe v Vitaliy Zatsepin | 6-2,6-2 |