| US Open | 2019/07/11 00:25 | Dong Keun Lee v Zeqi Zhou | W | 2-0 |
| Canada Open | 2019/07/03 18:30 | Dong Keun Lee v Sheng Po Yu | L | 0-2 |
| Australian Open | 2019/06/05 03:00 | Sai Praneeth B. v Dong Keun Lee | L | 2-0 |
| Sudirman Cup | 2019/05/22 04:00 | Tien Chen Chou v Dong Keun Lee | L | 2-0 |
| Asia Championships | 2019/04/24 02:00 | Kento Momota v Dong Keun Lee | L | 2-0 |
| Singapore Open | 2019/04/10 06:40 | Jan O Jorgensen v Dong Keun Lee | L | 2-0 |
| Malaysia Open | 2019/04/03 06:00 | Khosit Phetpradab v Dong Keun Lee | L | 2-0 |
| Swiss Open | 2019/03/14 17:30 | Dan Lin v Dong Keun Lee | L | 2-0 |
| US Open | 2019/07/10 22:10 | Victor Svendsen v Koki Watanabe | W | 0-2 |
| Canada Open | 2019/07/06 21:30 | Koki Watanabe v Shifeng Li | L | 1-2 |
| Canada Open | 2019/07/05 22:00 | Rajiv Ouseph v Koki Watanabe | W | 0-2 |
| Canada Open | 2019/07/04 21:55 | Lanxi Lei v Koki Watanabe | W | 1-2 |
| Canada Open | 2019/07/03 19:00 | Koki Watanabe v H.S. Prannoy | W | 2-0 |
| Canada Open | 2019/07/03 00:50 | Koki Watanabe v Jason Anthony Ho-Shue | W | 2-0 |
| Australian Open - Kval | 2019/06/04 00:10 | Feixiang Sun v Koki Watanabe | L | 2-1 |
| New Zealand Open Qual | 2019/04/29 22:35 | Koki Watanabe v Feixiang Sun | L | 0-2 |