Stadium: Court B Round: 27 Ground: Hardcourt outdoor
| ITF M15 Nonthaburi | 2019/11/28 04:40 | Duckhee Lee v Blake Ellis | 6-3,6-1 |
| ITF M15 Nonthaburi | 2019/11/27 02:30 | Duckhee Lee v Naoki Nakagawa | 6-1,6-4 |
| Challenger Pune | 2019/11/14 08:45 | Duckhee Lee v Jay Clarke | 1-6,4-6 |
| Challenger Pune | 2019/11/13 08:05 | Duckhee Lee v Mohamed Aziz Dougaz | 6-3,6-4 |
| Challenger Kobe | 2019/11/05 02:50 | Duckhee Lee v Shintaro Imai | 4-6,2-6 |
| Challenger Shenzhen 2 | 2019/10/29 03:10 | Soonwoo Kwon v Duckhee Lee | 6-2,6-2 |
| Challenger Shenzhen 2 | 2019/10/28 05:10 | Kaichi Uchida v Duckhee Lee | 5-7,1-6 |
| Challenger Liuzhou | 2019/10/22 03:35 | Duckhee Lee v Jie Cui | 2-6,4-6 |
| ITF M15 Nonthaburi | 2019/11/28 02:30 | Keisuke Saitoh v Rio Noguchi | 7-5,7-6 |
| ITF M15 Nonthaburi | 2019/11/27 02:30 | Keisuke Saitoh v Ryota Tanuma | 6-2,7-6 |
| ITF M15 Akishima | 2019/06/14 03:15 | Rio Noguchi v Keisuke Saitoh | 6-1,6-1 |
| ITF M15 Akishima | 2019/06/13 04:05 | Keisuke Saitoh v Gengo Kikuchi | 7-5,6-0 |
| ITF M15 Akishima | 2019/06/12 02:40 | Keisuke Saitoh v Kyohei Yamanaka | 6-1,6-3 |
| ITF M15 Kashiwa | 2019/04/04 01:00 | Yusuke Takahashi v Keisuke Saitoh | 6-2,6-1 |
| ITF M15 Kofu | 2019/03/19 01:00 | Keisuke Saitoh v Jumpei Yamasaki | 2-6,3-6 |
| ITF M15 Nishi-Tokyo | 2019/03/13 01:00 | Shuichi Sekiguchi v Keisuke Saitoh | 6-3,6-2 |