Head to Head
| Qatar Open Women | 2017/06/02 16:30 | Jonathan Groth v Koki Niwa | W | 2-4 |
Home History
| Qatar Open Women | 2018/08/23 14:00 | Mizuki Oikawa v Koki Niwa | L | 4-1 |
| Bulgaria Open | 2018/08/18 11:40 | Koki Niwa v Xin Xu | L | 0-4 |
| Bulgaria Open | 2018/08/17 15:20 | Koki Niwa v Mattias Falck | W | 4-2 |
| Bulgaria Open | 2018/08/16 16:50 | Koki Niwa v Dang Qiu | W | 4-1 |
| Qatar Open XD | 2018/07/26 06:30 | Koki Niwa v Yu Zhou | L | 2-4 |
| Qatar Open Women | 2018/07/19 09:40 | Koki Niwa v Sangeun Jeong | L | 2-4 |
| Qatar Open Women | 2018/06/08 04:30 | Koki Niwa v Kazuhiro Yoshimura | L | 2-4 |
| Czech Extraleague | 2018/06/02 06:10 | Zhendong Fan v Koki Niwa | L | 4-1 |
Away History
| Qatar Open Women | 2018/10/19 11:15 | Jonathan Groth v Mattias Falck | W | 4-3 |
| Qatar Open Women | 2018/10/19 08:45 | Jonathan Groth v Heming Hu | W | 4-0 |
| Qatar Open Women | 2018/10/12 16:47 | Pawel Fertikowski v Jonathan Groth | W | 0-3 |
| Qatar Open Women | 2018/09/28 14:39 | Jonathan Groth v Tian Yuan Chen | W | 3-1 |
| Qatar Open Women | 2018/09/22 12:45 | Jonathan Groth v Ovidiu Ionescu | L | 2-4 |
| Qatar Open Women | 2018/09/21 15:30 | Jonathan Groth v Diogo Carvalho | W | 4-1 |
| Qatar Open Women | 2018/09/20 18:40 | Jonathan Groth v Yevhen Pryshchepa | W | 4-2 |
| Qatar Open Women | 2018/08/24 17:30 | Jonathan Groth v Patrick Franziska | L | 2-4 |