stadio: Court 6 Round: 27 Ground: Hardcourt outdoor
| ITF M15 Nonthaburi | 2019/11/29 03:00 | Duckhee Lee v Keisuke Saitoh | 6-2,6-1 |
| ITF M15 Yanagawa | 2023/12/28 01:00 | Mikalai Haliak v Keisuke Saitoh | 4-6,3-6 |
| ITF M15 Yanagawa | 2023/12/27 00:30 | Keisuke Saitoh v Taki Adachi | 6-1,6-1 |
| ITF M15 Yanagawa | 2023/12/20 07:15 | Linang Xiao v Keisuke Saitoh | 6-0,6-2 |
| ITF M25 Gold Coast | 2023/11/29 01:30 | Keisuke Saitoh v Blake Mott | 2-6,2-6 |
| ITF M25 Brisbane | 2023/11/22 23:50 | Moerani Bouzige v Keisuke Saitoh | 6-4,2-6,7-5 |
| ITF M25 Brisbane | 2023/11/21 05:25 | Keisuke Saitoh v Thomas Fancutt | 4-6,7-5,6-4 |
| 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 M15 Yanagawa | 2023/12/28 02:40 | Ko Suzuki v Duckhee Lee | 1-6,2-6 |
| ITF M15 Yanagawa | 2023/12/27 00:30 | Seita Watanabe v Duckhee Lee | 1-6,6-7 |
| ITF M15 Kuala Lumpur | 2023/11/29 01:30 | Duckhee Lee v Seungmin Park | 6-4,2-6,6-1 |
| ITF M15 Ipoh Perak | 2023/11/24 02:00 | Alexey Zakharov v Duckhee Lee | 6-4,6-4 |
| ITF M15 Ipoh Perak | 2023/11/23 02:30 | Andrea Bacaloni v Duckhee Lee | 3-6,3-6 |
| ITF M15 Ipoh Perak | 2023/11/21 08:35 | Darrshan Suresh Kumar v Duckhee Lee | 1-6,3-6 |
| ITF M25 Hong Kong | 2023/09/07 02:30 | Duckhee Lee v Ryuki Matsuda | 6-3,4-6,4-6 |
| ITF M25 Hong Kong | 2023/09/06 06:00 | Luca Castelnuovo v Duckhee Lee | 6-3,4-6,5-7 |