Koki Niwa vs Anton Kallberg | MS | WTT Contender Lima 2022 | (QF)
Horacio Cifuentes vs Koki Niwa | MS | WTT Contender Lima 2022 | (R16)
Koki Niwa vs Brian Afanador | MS | WTT Contender Lima 2022 | (R32)
Koki Niwa vs Daniel Habesohn | 2021 World Table Tennis Championships Finals | MS | R64
Koki Niwa vs Nandor Ecseki | 2021 World Table Tennis Championships Finals | MS | R128
Team match Japan vs South Korea - Olympics 2020
Timo Boll / Patrick Franzisca vs Koki Niwa / Jun Mizutani - TOKYO 2020
Koki Niwa vs Gustavo Tsuboi | WTT Star Contender Doha 2021 | MS | R32 Highlights
Lin Gaoyuan vs Koki Niwa | Bank of Communications 2020 ITTF Finals (R16)
Koki Niwa vs Jang Woojin | 2020 ITTF Men's World Cup Highlights (R16)