| Giraldilla Int. XD | 2017/09/19 07:06 | Kazumasa Sakai v Dong Keun Lee | L | 0-2 |
| Indonesia Masters | 2019/10/02 12:20 | Kazumasa Sakai v Wisnu Yuli Prasetyo | L | 0-2 |
| Chinese Taipei Open | 2019/09/04 10:40 | Kazumasa Sakai v Sourabh Verma | L | 0-2 |
| Akita Masters | 2019/08/15 02:15 | Kazumasa Sakai v Yu Igarashi | L | 1-2 |
| Akita Masters | 2019/08/14 03:30 | Kazumasa Sakai v Kodai Naraoka | W | 2-0 |
| US Open | 2019/07/11 21:15 | Tanongsak Saensomboonsuk v Kazumasa Sakai | L | 2-0 |
| US Open | 2019/07/10 21:15 | Timothy Lam v Kazumasa Sakai | W | 0-2 |
| Canada Open | 2019/07/03 17:50 | Kazumasa Sakai v Kwang Hee Heo | L | 0-2 |
| Australian Open | 2019/06/07 08:00 | Tzu Wei Wang v Kazumasa Sakai | L | 2-0 |
| India PBL | 2020/01/22 13:45 | Lakshya Sen v Dong Keun Lee | L | 2-0 |
| Korea Masters | 2019/11/20 07:00 | Dong Keun Lee v Dan Lin | L | 1-2 |
| Macau Open | 2019/10/31 05:20 | Dong Keun Lee v Sitthikom Thammasin | L | 0-2 |
| 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 |