Face à face
| Qatar Open XD | 2017/06/24 07:30 | Tomokazu Harimoto v Koki Niwa | L | 4-0 |
Home History
| T2 Diamond | 2019/11/21 13:15 | Koki Niwa v Hugo Calderano | W | 4-2 |
| Austrian Open 2019, MS | 2019/11/16 15:50 | Hugo Calderano v Koki Niwa | L | 4-2 |
| Austrian Open 2019, MS | 2019/11/15 16:50 | Koki Niwa v Mattias Falck | W | 4-2 |
| Austrian Open 2019, MS | 2019/11/14 17:20 | Koki Niwa v Benedikt Duda | W | 4-2 |
| Team World Cup, Doubles | 2019/11/06 09:00 | Koki Niwa v Daniel Habesohn | W | 3-2 |
| Team World Cup, Doubles | 2019/11/06 03:30 | Liam Pitchford v Koki Niwa | L | 3-0 |
| German Open 2020, MS | 2019/10/11 16:40 | Jeoung, Youngsik v Koki Niwa | L | 4-3 |
| German Open 2020, MS | 2019/10/10 14:40 | Kenta Matsudaira v Koki Niwa | W | 1-4 |
Away History
| T2 Diamond | 2019/11/21 05:30 | Zhe Yu Clarence Chew v Tomokazu Harimoto | W | 1-4 |
| Austrian Open 2019, MS | 2019/11/15 16:50 | Dimitrij Ovtcharov v Tomokazu Harimoto | L | 4-3 |
| Austrian Open 2019, MS | 2019/11/14 14:50 | Ruwen Filus v Tomokazu Harimoto | W | 1-4 |
| Team World Cup, Doubles | 2019/11/09 08:45 | Zhendong Fan v Tomokazu Harimoto | L | 3-0 |
| Team World Cup, Doubles | 2019/11/07 12:00 | Tomokazu Harimoto v Patrick Franziska | W | 3-1 |
| Team World Cup, Doubles | 2019/11/07 11:00 | Tomokazu Harimoto v Dimitrij Ovtcharov | W | 3-1 |
| Team World Cup, Doubles | 2019/11/06 09:30 | Tomokazu Harimoto v Fegerl, Stefan | W | 3-0 |
| Team World Cup, Doubles | 2019/11/06 08:30 | Tomokazu Harimoto v Robert Gardos | W | 3-0 |
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