| Open de EE. UU. | 2019/07/11 22:00 | Dong Keun Lee v Koki Watanabe | L | 2-1 |
| Open de EE. UU. | 2019/07/10 22:10 | Victor Svendsen v Koki Watanabe | W | 0-2 |
| Open de Canadá | 2019/07/06 21:30 | Koki Watanabe v Shifeng Li | L | 1-2 |
| Open de Canadá | 2019/07/05 22:00 | Rajiv Ouseph v Koki Watanabe | W | 0-2 |
| Open de Canadá | 2019/07/04 21:55 | Lanxi Lei v Koki Watanabe | W | 1-2 |
| Open de Canadá | 2019/07/03 19:00 | Koki Watanabe v H.S. Prannoy | W | 2-0 |
| Open de Canadá | 2019/07/03 00:50 | Koki Watanabe v Jason Anthony Ho-Shue | W | 2-0 |
| Open de Australia - Clasificación | 2019/06/04 00:10 | Feixiang Sun v Koki Watanabe | L | 2-1 |
| Akita Masters | 2019/08/13 01:20 | Minoru Koga v Gatjra P F Cupu | W | 2-1 |
| Open de Canadá | 2019/07/03 01:30 | Minoru Koga v Lanxi Lei | L | 1-2 |
| Slovenia Int. | 2019/05/18 08:40 | Sourabh Verma v Minoru Koga | L | 2-0 |
| Slovenia Int. | 2019/05/17 14:30 | Minoru Koga v Christo Popov | W | 2-0 |
| Slovenia Int. | 2019/05/16 16:40 | Adrian Dziolko v Minoru Koga | W | 0-2 |
| Denmark Int. | 2019/05/10 16:30 | Minoru Koga v Sergey Sirant | L | 1-2 |
| Osaka Int. | 2019/04/04 01:20 | Pengbo Ren v Minoru Koga | L | 2-0 |
| Tong Yun Kai Cup | 2019/03/21 12:00 | Minoru Koga v Ka Long Angus NG | L | 1-2 |