Face à face
| Qatar Open 2019, MS | 2018/06/08 04:30 | Koki Niwa v Yoshimura, Kazuhiro | L | 2-4 |
Home History
| Qatar Open 2019, MS | 2018/11/08 15:20 | Koki Niwa v Qihao Zhou | W | 4-2 |
| Swedish Open (WTP) 2019, MS, Qualification | 2018/11/02 18:00 | Koki Niwa v Kristian Karlsson | L | 2-4 |
| Swedish Open (WTP) 2019, MS, Qualification | 2018/11/01 15:00 | Koki Niwa v Darko Jorgic | W | 4-3 |
| Qatar Open 2019, MS | 2018/10/20 17:45 | Koki Niwa v Gaoyuan Lin | L | 1-4 |
| Qatar Open 2019, MS | 2018/10/20 09:30 | Koki Niwa v Jonathan Groth | W | 4-1 |
| Qatar Open 2019, MS | 2018/08/23 14:00 | Mizuki Oikawa v Koki Niwa | L | 4-1 |
| Bulgaria Open 2019, MS | 2018/08/18 11:40 | Koki Niwa v Xu, Xin | L | 0-4 |
| Bulgaria Open 2019, MS | 2018/08/17 15:20 | Koki Niwa v Mattias Falck | W | 4-2 |
Away History
| Qatar Open 2019, MS | 2018/11/08 15:20 | Yoshimura, Kazuhiro v Gaoyuan Lin | W | 4-2 |
| Qatar Open XD | 2018/08/22 12:10 | Cedric Nuytinck v Yoshimura, Kazuhiro | L | 4-2 |
| Qatar Open XD | 2018/07/25 07:30 | Masataka Morizono v Yoshimura, Kazuhiro | L | 4-1 |
| Qatar Open 2019, MS | 2018/06/08 10:30 | Yoshimura, Kazuhiro v Ueda, Jin | L | 3-4 |
| Qatar Open 2019, MS | 2018/06/08 04:30 | Koki Niwa v Yoshimura, Kazuhiro | W | 2-4 |
| Qatar Open XD | 2018/06/07 06:10 | Chien-An Chen v Yoshimura, Kazuhiro | W | 2-4 |
| République tchèque - Extraleague | 2018/05/27 08:30 | Seungmin Cho v Yoshimura, Kazuhiro | W | 1-4 |
| République tchèque - Extraleague | 2018/05/26 13:30 | Jonghoon Lim v Yoshimura, Kazuhiro | W | 3-4 |