Stadium: Indoor A Round: 25 Ground: Hardcourt outdoor
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/06 01:00 | Keisuke Saitoh v Tomohiro Masabayashi | 4-6,6-3,1-6 |
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/06 01:00 | Keisuke Saitoh v Tomohiro Masabayashi | 4-6,6-3,1-6 |
| Hong Kong, Simples M-ITF-HKG-04A | 2023/08/31 02:00 | Naoki Nakagawa v Keisuke Saitoh | 6-4,6-7,6-1 |
| Hong Kong, Simples M-ITF-HKG-04A | 2023/08/30 02:00 | Keisuke Saitoh v Son, Ji Hoon | 6-3,7-6 |
| ITF M15 Caloundra | 2023/08/04 00:55 | Isaac Becroft v Keisuke Saitoh | 6-3,6-4 |
| ITF M15 Caloundra | 2023/08/03 00:50 | Tai Leonard Sach v Keisuke Saitoh | 2-6,1-6 |
| ITF M15 Caloundra | 2023/08/01 04:50 | Keisuke Saitoh v Edward Winter | 7-6,6-2 |
| ITF M15 Caloundra | 2023/07/27 00:00 | Isaac Becroft v Keisuke Saitoh | 5-7,6-2,6-1 |
| ITF M15 Caloundra | 2023/07/25 03:30 | Matthew Burton v Keisuke Saitoh | 3-6,2-6 |
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/11 03:15 | Tomohiro Masabayashi v Fields, Omar | 7-5,2-6,10-7 |
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/07 01:00 | Tomohiro Masabayashi v Daisuke Sumizawa | 3-6,3-6 |
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/06 01:00 | Keisuke Saitoh v Tomohiro Masabayashi | 4-6,6-3,1-6 |
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/04 01:00 | Tomohiro Masabayashi v Huang, Chih Chi | 6-3,6-3 |
| ITF M25 Tainan | 2023/08/24 02:00 | Ergi Kirkin v Tomohiro Masabayashi | 6-4,6-3 |
| ITF M25 Tainan | 2023/08/23 04:55 | Lo, Chien Hsun v Tomohiro Masabayashi | 7-5,5-7,3-6 |
| ITF M25 Tainan | 2023/08/17 02:00 | Tomohiro Masabayashi v Makoto Ochi | 6-7,1-6 |
| Jakarta, Singles Main, M-ITF-INA-02A | 2023/06/27 05:00 | Nathan Anthony Barki v Tomohiro Masabayashi | 6-2,6-4 |