Stadium: Court 2 Round: 25 Ground: Clay
| Challenger Yokohama | 2019/03/01 02:00 | Duckhee Lee v Soonwoo Kwon | 1-6,0-6 |
| Challenger Yokohama | 2019/02/28 03:25 | Tatsuma Ito v Duckhee Lee | 3-6,6-4,6-7 |
| Challenger Yokohama | 2019/02/27 01:00 | Duckhee Lee v Enzo Couacaud | 6-0,6-2 |
| Challenger Yokohama | 2019/02/26 01:00 | Duckhee Lee v Zihao Xia | 6-0,6-3 |
| Challenger Bangkok 1A | 2019/02/19 07:35 | Alejandro Davidovich Fokina v Duckhee Lee | 6-4,6-2 |
| Challenger Bangkok 1A | 2019/02/18 06:35 | Duckhee Lee v Thanapet Chanta | 6-2,7-6 |
| Challenger Bangkok | 2019/02/12 08:15 | Duckhee Lee v Viktor Troicki | 1-6,2-6 |
| Challenger Bangkok | 2019/02/11 03:00 | Wishaya Trongcharoenchaikul v Duckhee Lee | 3-6,3-6 |
| Challenger Yokohama | 2019/02/26 02:20 | Goncalo Oliveira v Ivan Gakhov | 3-6,6-7 |
| Challenger Bangkok 1A | 2019/02/20 03:00 | Goncalo Oliveira v Soonwoo Kwon | 2-6,7-6,1-6 |
| Challenger Bangkok 1A | 2019/02/18 07:40 | Maverick Banes v Goncalo Oliveira | 2-6,6-3,6-7 |
| Challenger Bangkok | 2019/02/11 07:25 | Goncalo Oliveira v Enrique Lopez-Perez | 4-6,4-6 |
| Challenger Dallas | 2019/02/05 00:35 | Goncalo Oliveira v Michael Redlicki | 2-6,6-4,1-6 |
| Challenger Cleveland | 2019/01/30 20:00 | Goncalo Oliveira v Marcos Giron | 6-4,1-6,2-6 |
| Challenger Cleveland | 2019/01/29 15:00 | Goncalo Oliveira v Evan King | 6-2,5-7,6-3 |
| Challenger Newport Beach | 2019/01/21 22:50 | Goncalo Oliveira v Marcos Giron | 7-6,3-6,3-6 |