Stadion: Court 3 Round: 26 Ground: Hardcourt outdoor
| ITF - M25 - Takasaki | 2023/09/20 02:45 | Tatsuma Ito v Toa Maeda | 6-3,6-0 |
| ITF - M25 - Sapporo | 2023/09/12 02:00 | Naoki Tajima v Tatsuma Ito | 3-6,1-6 |
| ITF - M25 - Sapporo | 2023/09/07 03:00 | Ryotaro Matsumura v Tatsuma Ito | 7-6,6-4 |
| ITF - M25 - Sapporo | 2023/09/06 03:35 | Seita Watanabe v Tatsuma Ito | 6-4,4-6,4-6 |
| ITF - M25 - Hongkong | 2023/08/30 02:00 | Kasidit Samrej v Tatsuma Ito | 6-1,6-4 |
| Challenger - Winnipeg | 2023/08/14 16:00 | Kiranpal Pannu v Tatsuma Ito | 7-5,4-6,6-1 |
| Challenger - Winnipeg | 2023/08/13 16:00 | Keegan Rice v Tatsuma Ito | 4-6,5-7 |
| Challenger - Cary | 2023/08/06 14:00 | Fons Van Sambeek v Tatsuma Ito | 7-6,1-6,6-3 |
| ITF - M25 - Takasaki | 2023/09/19 00:55 | Yuta Kikuchi v Koki Matsuda | 3-6,2-6 |
| ITF - M25 - Sapporo | 2023/09/15 05:35 | Naoki Nakagawa v Koki Matsuda | 6-4,6-2 |
| ITF - M25 - Sapporo | 2023/09/15 00:55 | Koki Matsuda v Daisuke Sumizawa | 6-0,7-6 |
| ITF - M25 - Sapporo | 2023/09/12 05:40 | Takuya Kumasaka v Koki Matsuda | 0-6,2-6 |
| ITF - M25 - Sapporo | 2023/09/04 01:00 | Koki Matsuda v Ko Suzuki | 6-1,4-6,7-10 |
| ITF - M25 - Tainan | 2023/08/15 04:45 | Koki Matsuda v Makoto Ochi | 3-6,7-5,4-6 |
| ITF - M25 - Jakarta | 2023/08/09 05:30 | Koki Matsuda v Arthur Weber | 2-6,2-6 |
| UTR Pro - Osaka | 2023/07/30 02:00 | Koki Matsuda v Rikuto Yamaguchi | 7-6,6-1 |