Stadium: Center Court Round: 26 Ground: Hardcourt outdoor
| ITF Japan F4 | 2014/04/02 01:00 | Duckhee Lee v Ko Suzuki | 7-5,7-5 |
| ITF M15 - Yanagawa | 2023/12/27 02:10 | Kenta Miyoshi v Ko Suzuki | 6-7,3-6 |
| ITF M15 - Yanagawa | 2023/12/26 00:30 | Ko Suzuki v Taketo Takamisawa | 6-1,5-7,10-8 |
| ITF M15 - Yanagawa | 2023/12/21 00:30 | Sanhui Shin v Ko Suzuki | 6-1,6-4 |
| ITF M15 - Yanagawa | 2023/12/20 03:00 | Shohei Chikami v Ko Suzuki | 3-6,3-6 |
| ITF M15 - Yanagawa | 2023/12/18 03:00 | Taki Adachi v Ko Suzuki | 0-6,2-6 |
| ITF M25 - Takasaki | 2023/09/18 01:00 | Ryotaro Taguchi v Ko Suzuki | 6-2,7-5 |
| ITF M25 - Takasaki | 2023/09/17 01:00 | Mao Takada v Ko Suzuki | 3-6,4-6 |
| ITF M25 - Sapporo | 2023/09/11 00:55 | Naoki Tajima v Ko Suzuki | 7-6,4-6,10-8 |
| 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 |
| ITF M25 Hong Kong | 2023/08/31 04:25 | Duckhee Lee v Kasidit Samrej | 2-6,2-6 |