| Thomas Cup | 05/02 11:05 | - | Koki Watanabe v Jun Hao Leong | L | 0-2 | |
| Thomas Cup | 05/01 11:35 | - | Koki Watanabe v Chun-Yi Lin | W | 2-0 | |
| Thomas Cup | 04/29 10:45 | - | Koki Watanabe v Fabian Roth | W | 2-0 | |
| Thomas Cup | 04/28 01:55 | - | Koki Watanabe v Jiri Kral | W | 2-0 | |
| Asia Championships | 04/10 11:00 | 5 | Koki Watanabe v Cheuk Yiu Lee | L | 0-2 | |
| Swiss Open | 03/20 16:30 | 5 | Alex Lanier v Koki Watanabe | L | 2-1 | |
| All England Open | 03/15 12:35 | 3 | Koki Watanabe v Christo Popov | L | 0-2 | |
| All England Open | 03/14 10:55 | 4 | Toma Junior Popov v Koki Watanabe | W | 0-2 | |
| All England Open | 03/12 10:45 | 5 | Koki Watanabe v Tzu Wei Wang | W | 2-0 | |
| French Open | 03/05 13:55 | 5 | Shi Feng Li v Koki Watanabe | L | 2-0 | |
| India Open | 01/19 12:05 | 3 | Koki Watanabe v Yu Qi Shi | L | 0-2 | |
| India Open | 01/18 06:25 | 4 | Shi Feng Li v Koki Watanabe | W | 1-2 | |
| India Open | 01/18 04:30 | 5 | Tze Yong Ng v Koki Watanabe | - | Cancelled | |
| India Open | 01/16 04:15 | 5 | Chia Hao Lee v Koki Watanabe | W | 1-2 | |
| Malaysia Open | 01/11 06:25 | 4 | Koki Watanabe v Anders Antonsen | L | 0-2 | |
| Malaysia Open | 01/10 05:35 | 5 | Tze Yong Ng v Koki Watanabe | D | Retired | |
| China Masters | 11/21 07:10 | 5 | Koki Watanabe v Kanta Tsuneyama | L | 1-2 | |
| Japan Masters | 11/17 03:25 | 3 | Tien Chen Chou v Koki Watanabe | L | 2-0 | |
| Japan Masters | 11/16 05:45 | 4 | Koki Watanabe v Hong Yang Weng | W | 2-1 | |
| Japan Masters | 11/15 10:20 | 5 | Koki Watanabe v Magnus Johannesen | W | 2-0 | |
| Korea Masters | 11/12 05:15 | 1 | Koki Watanabe v Kento Momota | L | 0-2 | |
| Korea Masters | 11/11 03:40 | 2 | Tzu Wei Wang v Koki Watanabe | W | 0-2 | |
| Korea Masters | 11/10 03:20 | 3 | Chun-Yi Lin v Koki Watanabe | W | 0-2 | |
| Korea Masters | 11/09 03:05 | 4 | Koki Watanabe v Takuma Obayashi | W | 2-1 | |
| Korea Masters | 11/08 04:35 | 5 | Koki Watanabe v Alwi Farhan | W | 2-1 | |
| French Open | 10/25 14:15 | 5 | Koki Watanabe v Tien Chen Chou | L | 1-2 | |
| Denmark Open | 10/19 14:10 | 4 | Koki Watanabe v Cheuk Yiu Lee | L | 1-2 | |
| Denmark Open | 10/18 19:25 | 5 | Misha Zilberman v Koki Watanabe | W | 1-2 | |
| Denmark Open | 10/18 06:00 | - | H.S. Prannoy v Koki Watanabe | - | Cancelled | |
| Arctic Open | 10/13 17:50 | 3 | Anders Antonsen v Koki Watanabe | L | 2-1 |