Stadium: Court 5 Round: 62 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 M25 Monastir | 2023/11/13 08:00 | Stefan Frljanic v Siim Troost | 2-6,3-6 |
| ITF M25 Monastir | 2023/11/12 08:00 | Lyle Zaloumis v Stefan Frljanic | 4-6,1-6 |
| ITF M25 Monastir | 2023/11/05 10:30 | Leonardo Iemmi v Stefan Frljanic | 1-6,6-4,11-9 |
| ITF M15 Monastir | 2023/10/29 09:30 | Stefan Frljanic v Aleksei Mokrov | 2-6,0-6 |
| ITF M15 Monastir | 2023/10/22 08:00 | Edouard Villoslada v Stefan Frljanic | 6-4,6-0 |
| ITF M15 Monastir | 2023/10/15 08:00 | Michael Gloeckler v Stefan Frljanic | 6-4,7-6 |
| ITF M15 Tacarigua | 2023/04/24 18:00 | Evan Bynoe v Stefan Frljanic | 6-0,10-1 |
| ITF M15 Tacarigua | 2023/04/23 18:00 | Stefan Frljanic v Leonardo Vega | 7-5,6-1 |