| Qatar Open - Dames | 02/18 05:30 | 3 | Tianyi Jiang v Koki Niwa | W | 1-4 | |
| Qatar Open - Dames | 02/17 09:45 | 4 | Harmeet Desai v Koki Niwa | W | 1-4 | |
| Qatar Open - Dames | 02/16 11:15 | 5 | Amalraj Anthony v Koki Niwa | W | 0-4 | |
| Qatar Open - Dames | 12/09 12:00 | 4 | Koki Niwa v Zhendong Fan | L | 1-4 | |
| Swedish Open | 11/19 12:00 | 4 | Mattias Karlsson v Koki Niwa | L | 4-1 | |
| Swedish Open | 11/18 17:40 | 5 | Sharath Kamal Achanta v Koki Niwa | W | 0-4 | |
| Swedish Open | 11/18 12:45 | 6 | Hampus Nordberg v Koki Niwa | W | 1-4 | |
| Qatar Open - GD | 11/12 12:00 | 4 | Koki Niwa v Kenta Matsudaira | L | 1-4 | |
| Qatar Open - GD | 11/11 19:30 | 5 | Koki Niwa v Minhyeok Kim | W | 4-0 | |
| Qatar Open - GD | 11/11 14:20 | 6 | Koki Niwa v Samuel Walker | W | 4-2 | |
| Qatar Open - Dames | 09/17 04:15 | 4 | Koki Niwa v Jike Zhang | L | 1-4 | |
| Qatar Open - Dames | 09/16 05:50 | 5 | Koki Niwa v Omer Avi-Tal | W | 4-1 |
Wikipedia - Koki Niwa
Koki Niwa (Tomakomai, Hokkaido, 10 oktober 1994) is een Japanse professioneel tafeltennisser. Hij speelt linkshandig met de shakehandgreep.
In 2012 (Londen), 2016 (Rio de Janeiro) en 2020 (Tokio) nam hij deel aan de Olympische spelen.