| Macau Open | 2019/10/30 02:50 | June Wei Cheam v Dong Keun Lee | W | 0-2 |
| Korea Open Qual | 2019/09/24 05:00 | Dong Keun Lee v Donghun Kim | L | 0-2 |
| Korea Open Qual | 2019/09/24 01:40 | Brice Leverdez v Dong Keun Lee | W | 1-2 |
| Chinese Taipei Open | 2019/09/04 08:35 | Dong Keun Lee v Wing Ki Vincent Wong | L | 1-2 |
| World Championships | 2019/08/20 10:00 | Sai Praneeth B. v Dong Keun Lee | L | 2-0 |
| World Championships | 2019/08/19 19:30 | Dong Keun Lee v Daniel Fan | W | 2-0 |
| Thailand Open | 2019/07/31 08:20 | Dong Keun Lee v Tien Chen Chou | L | 0-2 |
| Japan Open | 2019/07/24 08:30 | Dong Keun Lee v Tien Chen Chou | L | 0-2 |
| Macau Open | 2019/10/30 02:20 | Joo Ven Soong v Sitthikom Thammasin | W | 1-2 |
| French Open | 2019/10/22 10:50 | Sitthikom Thammasin v Shesar Hiren Rhustavito | L | 0-2 |
| Denmark Open | 2019/10/18 14:20 | Sitthikom Thammasin v Tommy Sugiarto | L | 0-2 |
| Denmark Open | 2019/10/17 07:20 | Mark Caljouw v Sitthikom Thammasin | W | 1-2 |
| Denmark Open | 2019/10/15 07:20 | Sitthikom Thammasin v Parupalli Kashyap | W | 2-0 |
| Korea Open | 2019/09/25 12:00 | Sitthikom Thammasin v Tien Chen Chou | L | 0-2 |
| China Open | 2019/09/17 03:30 | Daren Liew v Sitthikom Thammasin | L | 2-1 |
| Akita Masters | 2019/08/15 03:55 | Sitthikom Thammasin v Hashiru Shimono | L | 1-2 |