Japan: W50 Nanao - Singles - Main |
| Quarter-finals | Okuwaki R. | Kaji H. | 2:0 (7:5, 6:4) | details | 27.09.2024 |
| 1/8-finals | Aney J. | Kaji H. | 1:2 (6:4, 4:6, 2:6) | details | 26.09.2024 |
| 1/16-finals | Saegusa N. | Kaji H. | 0:2 (4:6, 1:6) | details | 24.09.2024 |
South Korea: Seoul - Singles - Qualification |
| Semi-finals | Ku Y. | Kaji H. | 2:1 (0:6, 6:3, 6:2) | details | 14.09.2024 |
South Korea: W100 Incheon - Singles - Main |
| 1/8-finals | Kaji H. | Gao X. | 0:2 (1:6, 4:6) | details | 05.09.2024 |
| 1/16-finals | Zhao C. | Kaji H. | 0:2 (3:6, 4:6) | details | 03.09.2024 |
Spain: W35 Vigo - Singles - Main |
| 1/16-finals | Andrianjafitrimo T. | Kaji H. | 2:0 (6:3, 6:2) | details | 21.08.2024 |
Spain: W50 Ourense - Singles - Main |
| Final | Charaeva A. | Kaji H. | 2:0 (7:67, 6:1) | details | 18.08.2024 |
| Semi-finals | Kaji H. | Helgo M. | 2:0 (6:1, 6:1) | details | 17.08.2024 |
| Quarter-finals | Kubka M. | Kaji H. | 0:2 (1:6, 1:6) | details | 16.08.2024 |
| 1/8-finals | Matsuda M. | Kaji H. | 0:2 (3:6, 0:6) | details | 15.08.2024 |
| 1/16-finals | Sawant M. | Kaji H. | 0:2 (1:6, 0:6) | details | 14.08.2024 |
United Kingdom: W35 Roehampton 2 - Singles - Main |
| Final | Kartal S. | Kaji H. | 2:0 (6:3, 6:3) | details | 11.08.2024 |
| Semi-finals | Kaji H. | Imamura S. | 2:0 (7:65, 6:2) | details | 10.08.2024 |
| Quarter-finals | Kaji H. | McDonald E. | 2:1 (4:6, 7:65, 6:0) | details | 09.08.2024 |
| 1/8-finals | Kaji H. | Saigo R. | 2:1 (2:6, 6:2, 6:1) | details | 08.08.2024 |
| 1/16-finals | Kaji H. | Black B. | 2:0 (7:5, 6:1) | details | 06.08.2024 |
United Kingdom: W35 Roehampton - Singles - Main |
| 1/16-finals | Kaji H. | Ku Y. | 0:2 (3:6, 2:6) | details | 30.07.2024 |
Spain: W35 Segovia - Singles - Main |
| Quarter-finals | Mansouri Y. | Kaji H. | 2:0 (7:5, 6:3) | details | 25.07.2024 |
| 1/8-finals | Zelnickova R. | Kaji H. | 0:2 (4:6, 2:6) | details | 24.07.2024 |
| 1/16-finals | Gonzalez Vilar R. | Kaji H. | 0:2 (1:6, 3:6) | details | 23.07.2024 |
Hong Kong: W35 Hong Kong - Singles - Main |
| Semi-finals | Yao X. | Kaji H. | 2:1 (3:6, 6:3, 6:3) | details | 06.07.2024 |
| Quarter-finals | Kaji H. | Abe H. | 2:0 (6:0, 6:1) | details | 05.07.2024 |
| 1/8-finals | Kaji H. | Zolotareva A. | 2:0 (6:3, 6:3) | details | 04.07.2024 |
| 1/16-finals | Kaji H. | da Silva Fick G. | 2:1 (6:1, 5:7, 6:2) | details | 03.07.2024 |
South Korea: W35 Daegu - Singles - Main |
| 1/16-finals | Chaudhari V. | Kaji H. | 2:0 (6:1, 6:3) | details | 05.06.2024 |
South Korea: W35 Changwon - Singles - Main |
| Quarter-finals | Okamura K. | Kaji H. | 2:0 (6:1, 6:4) | details | 31.05.2024 |
| 1/8-finals | Ku Y. | Kaji H. | 1:2 (6:2, 3:6, 3:6) | details | 30.05.2024 |
| 1/16-finals | Kawaguchi N. | Kaji H. | 0:2 (2:6, 4:6) | details | 28.05.2024 |
South Korea: W50 Goyang - Singles - Main |
| Semi-finals | Kaji H. | Ito A. | 1:2 (6:3, 3:6, 0:6) | details | 25.05.2024 |
| Quarter-finals | Inoue H. | Kaji H. | 0:2 (66:7, 2:6) | details | 24.05.2024 |
| 1/8-finals | Kuramochi M. | Kaji H. | 1:2 (2:6, 6:4, 1:6) | details | 23.05.2024 |
| 1/16-finals | Yuan C. | Kaji H. | 0:2 (3:6, 2:6) | details | 21.05.2024 |
Japan: W75 Kurume - Singles - Main |
| 1/16-finals | Yamaguchi M. | Kaji H. | 2:0 (6:0, 6:4) | details | 15.05.2024 |
Japan: W75 Fukuoka - Singles - Main |
| 1/16-finals | Ito A. | Kaji H. | 2:0 (7:5, 6:2) | details | 07.05.2024 |
Japan: W100 Gifu - Singles - Main |
| 1/8-finals | Hontama M. | Kaji H. | 2:1 (4:6, 7:5, 6:3) | details | 02.05.2024 |
| 1/16-finals | Sawangkaew M. | Kaji H. | 1:2 (1:6, 6:3, 3:6) | details | 30.04.2024 |
Japan: W100 Tokyo - Singles - Main |
| 1/16-finals | Kaji H. | Birrell K. | 1:2 (6:1, 3:6, 2:6) | details | 24.04.2024 |
Japan: W35 Osaka - Singles - Main |
| Quarter-finals | Aiava D. | Kaji H. | 2:0 (6:1, 6:4) | details | 12.04.2024 |
| 1/8-finals | Shimizu A. | Kaji H. | 1:2 (7:62, 5:7, 4:6) | details | 11.04.2024 |
| 1/16-finals | Shimizu E. | Kaji H. | 0:2 (613:7, 3:6) | details | 10.04.2024 |
Japan: W50 Kashiwa - Singles - Main |
| 1/16-finals | Hartono A. | Kaji H. | 2:0 (6:4, 6:4) | details | 02.04.2024 |
Japan: W50 Kofu - Singles - Main |
| Quarter-finals | Harrison C. | Kaji H. | 2:1 (4:6, 6:4, 7:5) | details | 29.03.2024 |
| 1/8-finals | Kaji H. | Hon P. | 2:0 (6:3, 6:1) | details | 28.03.2024 |
| 1/16-finals | Kaji H. | Saigo R. | 2:0 (7:63, 6:2) | details | 27.03.2024 |
Italy: W35 Solarino 2 - Singles - Main |
| 1/16-finals | Szymczuch O. | Kaji H. | 2:0 (6:4, 6:4) | details | 13.03.2024 |
Italy: W35 Solarino - Singles - Main |
| Quarter-finals | Kaji H. | Klimovicova L. | 0:2 (4:6, 0:6) | details | 08.03.2024 |
| 1/8-finals | Kaji H. | Krajicek M. | 2:0 (6:3, 6:3) | details | 07.03.2024 |
| 1/16-finals | Kaji H. | Dal S. | 2:0 (6:0, 6:1) | details | 05.03.2024 |
Australia: W75 Burnie 2 - Singles - Main |
| Quarter-finals | Wei S. | Kaji H. | 2:0 (6:3, 6:4) | details | 09.02.2024 |