Stadium: Center Court Round: 24 Ground: Hardcourt outdoor
| Challenger Seoul | 2019/04/29 02:00 | Nam, Ji Sung v Ji Hoon Son | 6-3,6-2 |
| Matsuyama, Singles M-ITF-JPN-06A | 2019/04/12 01:00 | Nam, Ji Sung v Brymer, Gage | 3-6,3-6 |
| Matsuyama, Singles M-ITF-JPN-06A | 2019/04/09 04:55 | Nam, Ji Sung v Mark Whitehouse | 7-6,6-2 |
| ITF - M15 Kashiwa | 2019/04/03 06:15 | Jumpei Yamasaki v Nam, Ji Sung | 6-3,2-6,7-6 |
| ITF - M15 Nishi-Tokyo | 2019/03/15 02:20 | Ehara, Hiroyasu v Nam, Ji Sung | 6-3,3-6,7-6 |
| ITF - M15 Nishi-Tokyo | 2019/03/14 01:00 | Song, Min-Kyu v Nam, Ji Sung | 4-6,3-6 |
| ITF - M15 Nishi-Tokyo | 2019/03/13 03:50 | Tanaka, Yunosuke v Nam, Ji Sung | 6-4,1-6,5-7 |
| Nishi-Tama, Simples M-ITF-JPN-01A | 2019/03/10 01:00 | Shintaro Imai v Nam, Ji Sung | 6-2,6-2 |
| Nanchang, China | 2019/04/24 04:15 | Duckhee Lee v Goncalo Oliveira | 3-6,2-6 |
| Challenger - Taipei | 2019/04/08 03:20 | Kaichi Uchida v Duckhee Lee | 6-4,6-4 |
| Challenger - Shenzhen | 2019/03/15 09:00 | Schnur, Brayden v Duckhee Lee | 6-4,4-6,7-5 |
| Challenger - Shenzhen | 2019/03/14 10:55 | Zhe Li v Duckhee Lee | 3-6,3-6 |
| Challenger - Shenzhen | 2019/03/12 07:20 | Duckhee Lee v Sugita, Yuichi | 6-3,6-4 |
| Challenger - Shenzhen | 2019/03/11 03:50 | Xia, Zihao v Duckhee Lee | 3-6,1-6 |
| Challenger Zhuhai | 2019/03/04 05:25 | Crepatte, Baptiste v Duckhee Lee | 6-3,7-6 |
| Challenger Yokohama | 2019/03/01 02:00 | Duckhee Lee v Soonwoo Kwon | 1-6,0-6 |