| Giraldilla - Internacional - Dobles Mixtos | 2018/02/22 18:40 | Rajiv Ouseph v Koki Watanabe | L | 1-2 |
| Open de Canadá | 2019/07/04 21:00 | Hongyang Weng v Rajiv Ouseph | W | 0-2 |
| Open de Canadá | 2019/07/03 21:10 | Ajay Jayaram v Rajiv Ouseph | W | 0-2 |
| All England Open | 2019/03/06 11:30 | Tommy Sugiarto v Rajiv Ouseph | L | 2-0 |
| Spain Masters | 2019/02/22 14:30 | Rajiv Ouseph v Anders Antonsen | L | 0-2 |
| Spain Masters | 2019/02/21 10:40 | Tanongsak Saensomboonsuk v Rajiv Ouseph | W | 1-2 |
| Spain Masters | 2019/02/20 16:00 | Misha Zilberman v Rajiv Ouseph | W | 1-2 |
| Giraldilla - Internacional - Dobles Mixtos | 2019/02/15 13:30 | Rajiv Ouseph v Kai Schaefer | L | 0-2 |
| Giraldilla - Internacional - Dobles Mixtos | 2019/02/14 13:30 | Rajiv Ouseph v Nhat Nguyen | W | 2-0 |
| 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 |
| Open de Nueva Zelanda - Clasificación | 2019/04/29 22:35 | Koki Watanabe v Feixiang Sun | L | 0-2 |
| Osaka Int. | 2019/04/07 02:00 | Takuma Obayashi v Koki Watanabe | W | 1-2 |
| Osaka Int. | 2019/04/06 04:30 | Koki Watanabe v Pengbo Ren | W | 2-0 |
| Osaka Int. | 2019/04/04 06:40 | Hongyang Weng v Koki Watanabe | W | 0-2 |