Head to Head
| Olympics 2020 - Men | 2021/07/27 12:30 | Koki Niwa v Dimitrij Ovtcharov | L | 1-4 |
| Qatar Open Women | 2017/12/15 08:40 | Dimitrij Ovtcharov v Koki Niwa | L | 4-3 |
| Qatar Open Women | 2017/06/04 09:00 | Dimitrij Ovtcharov v Koki Niwa | W | 3-4 |
| Qatar Open Women | 2017/02/18 14:15 | Dimitrij Ovtcharov v Koki Niwa | L | 4-3 |
Home History
| Olympics 2020 - Team Men | 2021/08/03 02:30 | Koki Niwa v Mattias Falck | W | 3-0 |
| Olympics 2020 - Men | 2021/07/27 12:30 | Koki Niwa v Dimitrij Ovtcharov | L | 1-4 |
| Olympics 2020 - Men | 2021/07/27 06:30 | Koki Niwa v Yang Wang | W | 4-0 |
| WTT Star Contender Doha | 2021/03/09 12:35 | Koki Niwa v Gustavo Tsuboi | L | 0-3 |
| Japan T League | 2020/12/24 10:30 | Koki Niwa v Kazuhiro Yoshimura | L | 0-3 |
| Japan T League | 2020/12/23 11:35 | Jun Mizutani v Koki Niwa | L | 3-2 |
| Japan T League | 2020/12/22 06:30 | Panagiotis Gionis v Koki Niwa | W | 2-3 |
| Japan T League | 2020/12/20 09:30 | Koki Niwa v Kenta Matsudaira | L | 2-3 |
Away History
| Olympics 2020 - Team Men | 2021/08/04 11:00 | Tomokazu Harimoto v Dimitrij Ovtcharov | L | 3-1 |
| Olympics 2020 - Team Men | 2021/08/03 07:30 | Chih Yuan Chuang v Dimitrij Ovtcharov | W | 0-3 |
| Olympics 2020 - Team Men | 2021/08/03 06:00 | Yun-Ju Lin v Dimitrij Ovtcharov | L | 3-2 |
| Olympics 2020 - Team Men | 2021/08/01 11:10 | Marcos Freitas v Dimitrij Ovtcharov | W | 0-3 |
| Olympics 2020 - Men | 2021/07/30 11:00 | Yun-Ju Lin v Dimitrij Ovtcharov | W | 3-4 |
| Olympics 2020 - Men | 2021/07/29 07:00 | Dimitrij Ovtcharov v Long Ma | L | 3-4 |
| Olympics 2020 - Men | 2021/07/28 12:00 | Hugo Calderano v Dimitrij Ovtcharov | W | 2-4 |
| Olympics 2020 - Men | 2021/07/27 12:30 | Koki Niwa v Dimitrij Ovtcharov | W | 1-4 |