Stadium: Court 5 Round: 26 Ground: Hardcourt outdoor
| ITF M25 Takasaki | 2023/09/20 01:00 | Leo Vithoontien v Keisuke Saitoh | 6-4,6-3 |
| ITF M25 Sapporo | 2023/09/12 03:45 | Keisuke Saitoh v Tomohiro Masabayashi | 5-7,3-6 |
| ITF M25 Sapporo | 2023/09/06 01:00 | Keisuke Saitoh v Tomohiro Masabayashi | 4-6,6-3,1-6 |
| 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 02:00 | Keisuke Saitoh v Ji Hoon Son | 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 Arad | 2023/09/30 08:00 | Jakub Nicod v Vlad Andrei Dancu | 6-4,6-7,6-4 |
| ITF M15 Arad | 2023/09/29 07:00 | Matthew William Donald v Jakub Nicod | 4-6,3-6 |
| ITF M15 Arad | 2023/09/28 08:00 | Dan Alexandru Tomescu v Jakub Nicod | 2-6,2-6 |
| ITF M15 Arad | 2023/09/27 07:00 | Gabriele Maria Noce v Jakub Nicod | 3-6,6-7 |
| ITF M15 Arad | 2023/09/26 10:10 | Jakub Nicod v Lorenzo Bocchi | 6-4,6-0 |
| ITF M25 Pardubice | 2023/09/22 09:00 | Jonas Forejtek v Jakub Nicod | 7-5,6-3 |
| ITF M25 Pardubice | 2023/09/21 09:15 | Jakub Nicod v Hynek Barton | 6-1,6-2 |
| ITF M25 Pardubice | 2023/09/20 08:00 | Jakub Nicod v Jakub Filip | 6-2,0-6,6-2 |