Head to Head
| Swedish Open | 2016/11/19 12:00 | Mattias Karlsson v Koki Niwa | L | 4-1 |
Home History
| German Open WD | 2018/03/23 19:20 | Koki Niwa v Jin Ueda | W | 4-2 |
| Qatar Open | 2018/03/08 13:30 | Sharath Kamal Achanta v Koki Niwa | L | 4-1 |
| Qatar Open kvinner | 2018/02/25 16:00 | Long Ma v Koki Niwa | L | 3-1 |
| Qatar Open - Mixed double | 2018/02/24 17:40 | Koki Niwa v Youngsik Jeoung | L | 1-3 |
| Qatar Open - Mixed double | 2018/02/23 20:30 | Chun Ting Wong v Koki Niwa | L | 3-1 |
| Qatar Open - Mixed double | 2018/02/22 20:30 | Liam Pitchford v Koki Niwa | W | 0-3 |
| Qatar Open kvinner | 2017/12/15 08:40 | Dimitrij Ovtcharov v Koki Niwa | L | 4-3 |
| Qatar Open - Mixed double | 2017/11/18 15:15 | Koki Niwa v Bo Fang | L | 3-4 |
Away History
| German Open WD | 2018/03/23 19:20 | Mattias Karlsson v Hugo Calderano | W | 4-2 |
| Qatar Open | 2018/03/09 14:10 | Mattias Karlsson v Yu Zhou | L | 1-4 |
| Qatar Open | 2018/03/08 14:20 | Simon Gauzy v Mattias Karlsson | W | 1-4 |
| Qatar Open - Mixed double | 2018/03/07 15:10 | Mattias Karlsson v Woojin Jang | W | 4-3 |
| Qatar Open - Mixed double | 2018/03/06 13:50 | Mattias Karlsson v Dingshuo Liu | W | 4-3 |
| Qatar Open kvinner | 2018/02/03 17:50 | Vladimir Samsonov v Mattias Karlsson | L | 4-1 |
| Qatar Open kvinner | 2018/02/03 11:30 | Mattias Karlsson v Ruwen Filus | W | 4-1 |
| Qatar Open - Mixed double | 2018/01/18 13:40 | Kirill Gerassimenko v Mattias Karlsson | L | 4-3 |