Home History
| Bulgaria Open | 2018/08/16 16:50 | Koki Niwa v Dang Qiu | W | 4-1 |
| Qatar Open - Mixed double | 2018/07/26 06:30 | Koki Niwa v Yu Zhou | L | 2-4 |
| Qatar Open kvinner | 2018/07/19 09:40 | Koki Niwa v Sangeun Jeong | L | 2-4 |
| Qatar Open kvinner | 2018/06/08 04:30 | Koki Niwa v Kazuhiro Yoshimura | L | 2-4 |
| Tsjekkia - Extraleague | 2018/06/02 06:10 | Zhendong Fan v Koki Niwa | L | 4-1 |
| Tsjekkia - Extraleague | 2018/06/01 11:40 | Liam Pitchford v Koki Niwa | W | 3-4 |
| Tsjekkia - Extraleague | 2018/05/31 08:40 | Bojan Tokic v Koki Niwa | W | 2-4 |
| Qatar Open kvinner | 2018/05/03 12:00 | Siu Hang Lam v Koki Niwa | W | 0-3 |
Away History
| Bulgaria Open | 2018/08/16 16:50 | Ovidiu Ionescu v Mattias Falck | W | 1-4 |