| Olympics 2020 - Team Men | 08/06 02:00 | 20 | Jeoung Y / Lee S v Niwa K / Mizutani J | W | 1-3 | |
| Olympics 2020 - Team Men | 08/04 10:30 | 2 | Niwa K / Mizutani J v Boll T / Franziska P | L | 2-3 | |
| Olympics 2020 - Team Men | 08/02 01:00 | 3 | Niwa K / Mizutani J v Hu H / Yan X | W | 3-0 | |
| Hong Kong Open (WT) 2019, Doubles | 06/04 11:30 | 1 | Liventsov A / Paykov M v Niwa K / Mizutani J | L | 3-1 |