| US Open 2019, MS | 2019/07/11 22:00 | Lee, Dong Keun v Koki Watanabe | W | 2-1 |
| US Open 2019, MS | 2019/07/11 00:25 | Lee, Dong Keun v Zhou, Z. Q. | W | 2-0 |
| Canada Open | 2019/07/03 18:30 | Lee, Dong Keun v Yu, Sheng Po | L | 0-2 |
| Australian Open | 2019/06/05 03:00 | Sai Praneeth, B. v Lee, Dong Keun | L | 2-0 |
| Sudirman Cup | 2019/05/22 04:00 | Tien Chen Chou v Lee, Dong Keun | L | 2-0 |
| Asia Championships | 2019/04/24 02:00 | Kento Momota v Lee, Dong Keun | L | 2-0 |
| Singapore Open | 2019/04/10 06:40 | Joergensen, J. O. v Lee, Dong Keun | L | 2-0 |
| Open de Malaisie | 2019/04/03 06:00 | Phetpradab, Khosit v Lee, Dong Keun | L | 2-0 |
| US Open 2019, MS | 2019/07/11 22:10 | Li, S. F. v Chun-Yi Lin | W | 1-2 |
| US Open 2019, MS | 2019/07/10 22:00 | Ygor Coelho v Chun-Yi Lin | W | 0-2 |
| US Open 2019, MS, Qualification | 2019/07/09 20:55 | Liu, H. C. v Chun-Yi Lin | W | 1-2 |
| US Open 2019, MS, Qualification | 2019/07/09 19:35 | Chun-Yi Lin v Munoz, Lino | W | 2-0 |
| Canada Open | 2019/07/05 00:10 | Heo, Kwang Hee v Chun-Yi Lin | L | 2-1 |
| Canada Open | 2019/07/03 17:10 | Igarashi, Yu v Chun-Yi Lin | W | 0-2 |
| Canada Open | 2019/07/03 02:30 | Imran Wadia v Chun-Yi Lin | W | 0-2 |
| Finnish Open | 2019/04/07 07:30 | Chun-Yi Lin v Kunlavut Vitidsarn | L | 1-2 |