Japan: W25 Yokohama - Doubles - Main |
| Quarter-finals | Kaji H./Namigata J. | Sakatsume H./Ushijima R. | 1:2 (3:6, 6:4, 5:10) | dettagli | 05.03.2020 |
| 1/8-finals | Kaji H./Namigata J. | Kobori M./Shimizu A. | 2:0 (6:1, 6:4) | dettagli | 03.03.2020 |
Japan: W60 Kyoto - Doubles - Main |
| Semi-finals | Kaji H./Namigata J. | Hsieh Y./Yonehara M. | 1:2 (6:1, 3:6, 8:10) | dettagli | 22.02.2020 |
| Quarter-finals | Kaji H./Namigata J. | Omae A./Plipuech P. | 2:0 (6:4, 7:65) | dettagli | 20.02.2020 |
| 1/8-finals | Kaji H./Namigata J. | Morimoto N./Osafune K. | 2:0 (6:2, 6:1) | dettagli | 19.02.2020 |
Japan: Hiroshima - Doubles - Main |
| Semi-finals | McHale C./Savinykh V. | Kaji H./Namigata J. | 2:0 (6:4, 6:1) | dettagli | 13.09.2019 |
| Quarter-finals | Potapova A./Sizikova Y. | Kaji H./Namigata J. | 0:2 (3:6, 2:6) | dettagli | 12.09.2019 |
| 1/8-finals | Kaji H./Namigata J. | Hon P./Maria T. | 2:0 (7:5, 6:2) | dettagli | 11.09.2019 |