Home History
| Hong Kong Open (WT) 2019, Singles | 2019/06/06 08:50 | Koki Niwa v Sathiyan Gnanasekaran | W | 4-1 |
| ITTF China Open 2019, MS | 2019/05/31 12:30 | Long Ma v Koki Niwa | L | 4-0 |
| ITTF China Open 2019, MS | 2019/05/30 08:55 | Yoshimura, Kazuhiro v Koki Niwa | W | 0-4 |
| World Championship | 2019/04/26 10:45 | Jingkun Liang v Koki Niwa | L | 4-3 |
| World Championship | 2019/04/25 09:00 | Tomislav Pucar v Koki Niwa | W | 2-4 |
| World Championship | 2019/04/24 15:00 | Jakub Dyjas v Koki Niwa | W | 1-4 |
| World Championship | 2019/04/23 17:50 | Paul Drinkhall v Koki Niwa | W | 0-4 |
| World Championship | 2019/04/23 12:50 | Marcelo Aguirre v Koki Niwa | W | 1-4 |
Away History
| Hong Kong Open (WT) 2019, Singles | 2019/06/06 08:00 | Dang Qiu v Mizutani, Jun | W | 3-4 |
| ITTF China Open 2019, MS | 2019/05/31 12:00 | Mizutani, Jun v Xu, Xin | L | 0-4 |
| ITTF China Open 2019, MS | 2019/05/30 13:05 | Mizutani, Jun v Joao Geraldo | W | 4-0 |
| World Championship | 2019/04/24 10:50 | Mizutani, Jun v Jeoung, Youngsik | L | 3-4 |
| World Championship | 2019/04/23 18:40 | Mizutani, Jun v Can Akkuzu | W | 4-2 |
| World Championship | 2019/04/23 12:00 | Mizutani, Jun v Pereira, Andy | W | 4-1 |
| Qatar Open 2019, MS | 2019/03/30 07:00 | Mizutani, Jun v Long Ma | L | 0-4 |
| Qatar Open 2019, MS | 2019/03/29 15:30 | Pavel Sirucek v Mizutani, Jun | W | 0-4 |
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