Stadium: Center Round: 28 Ground: Hardcourt outdoor
| Challenger Kaohsiung | 2018/09/20 10:00 | Jason Jung v Duckhee Lee | 6-7,4-6 |
| Challenger Shenzhen | 2018/03/13 05:55 | Jason Jung v Duckhee Lee | 6-4,5-7,4-6 |
| Challenger Kaohsiung | 2017/10/03 10:00 | Jason Jung v Duckhee Lee | 3-6,6-2,7-6 |
| Challenger Zhangjiagang | 2017/09/05 06:35 | Jason Jung v Duckhee Lee | 6-4,6-1 |
| US Open | 2019/08/22 15:00 | Jiri Vesely v Jason Jung | 6-4,5-7,7-5 |
| US Open | 2019/08/20 16:15 | Donald Young v Jason Jung | 3-6,7-6,5-7 |
| Challenger Vancouver | 2019/08/18 21:15 | Ricardas Berankis v Jason Jung | 6-3,5-7,6-4 |
| Challenger Vancouver | 2019/08/17 22:00 | Maxime Janvier v Jason Jung | 5-7,6-7 |
| Challenger Vancouver | 2019/08/16 23:35 | Jason Jung v Marc Polmans | 5-7,6-4,6-4 |
| Challenger Vancouver | 2019/08/15 19:30 | Evgeny Donskoy v Jason Jung | 6-4,3-6,4-6 |
| Challenger Vancouver | 2019/08/13 17:00 | Ruben Bemelmans v Jason Jung | 4-6,2-6 |
| ATP Los Cabos | 2019/07/30 03:10 | Ernests Gulbis v Jason Jung | 6-4,7-6 |
| ATP Winston-Salem | 2019/08/20 19:10 | Duckhee Lee v Hubert Hurkacz | 6-4,0-6,3-6 |
| ATP Winston-Salem | 2019/08/19 19:00 | Duckhee Lee v Henri Laaksonen | 7-6,6-1 |
| Challenger Vancouver | 2019/08/14 17:00 | Duckhee Lee v Malek Jaziri | 6-2,4-6,1-6 |
| Challenger Vancouver | 2019/08/13 17:00 | Duckhee Lee v Maverick Banes | 6-1,6-4 |
| Challenger Aptos | 2019/08/05 19:55 | Maxime Janvier v Duckhee Lee | 6-4,4-6,6-4 |
| Challenger Lexington | 2019/08/02 23:40 | Jannik Sinner v Duckhee Lee | 4-6,6-3,6-1 |
| Challenger Lexington | 2019/08/01 14:00 | Evgeny Karlovskiy v Duckhee Lee | 6-4,2-6,4-6 |
| Challenger Lexington | 2019/07/30 16:25 | Nicolas Moreno De Alboran v Duckhee Lee | 2-6,3-6 |