USA: W15 San Diego, CA 4 - Doubles - Main |
| Quarter-finals | Payne B./Shumate S. | Kiss C./Usui K. | 2:0 (6:2, 6:0) | details | 10.07.2025 |
| 1/8-finals | Dunyon J./Mahendran K. | Kiss C./Usui K. | 1:2 (6:2, 3:6, 4:10) | details | 09.07.2025 |
USA: W15 Los Angeles, CA - Doubles - Main |
| Quarter-finals | An C./McNeil C. | Kiss C./Usui K. | 2:1 (4:6, 6:2, 10:5) | details | 04.07.2025 |
| 1/8-finals | Arora A./Haile A. | Kiss C./Usui K. | 0:2 (4:6, 2:6) | details | 03.07.2025 |
USA: W35 Wichita, KS - Doubles - Main |
| 1/8-finals | Jara S./Usui K. | Dean J./Rodriguez A. | 0:2 (2:6, 3:6) | details | 19.06.2025 |
USA: W35 Decatur, IL - Doubles - Main |
| Quarter-finals | Bittner A./Usui K. | Allen K./Okalova M. | 0:2 (1:6, 63:7) | details | 12.06.2025 |
| 1/8-finals | Koike E./Rodriguez A. | Bittner A./Usui K. | 0:2 (65:7, 65:7) | details | 10.06.2025 |
Japan: W15 Kashiwa - Doubles - Main |
| Quarter-finals | Kawagishi N./Saigo Y. | Sato H./Usui K. | 2:0 (6:3, 6:3) | details | 03.04.2025 |
| 1/8-finals | Sato H./Usui K. | Kikawada R./Miyata M. | 2:0 (6:3, 6:2) | details | 01.04.2025 |
Canada: W15 Montreal - Doubles - Main |
| 1/8-finals | Smith R./Usui K. | Keller K./Kosan K. | 0:2 (3:6, 5:7) | details | 11.03.2025 |
Canada: W15 Trois-Rivieres - Doubles - Main |
| Semi-finals | Smith R./Usui K. | Ionescu E./McNeil C. | 0:2 (4:6, 2:6) | details | 07.03.2025 |
| Quarter-finals | Smith R./Usui K. | Gruber T./Lacasse R. | 2:0 (6:1, 7:5) | details | 05.03.2025 |
| 1/8-finals | Morales M. F./Rsovac D. | Smith R./Usui K. | 0:2 (3:6, 2:6) | details | 04.03.2025 |
Mexico: W15 Huamantla 2 - Doubles - Main |
| Semi-finals | Jara S./Usui K. | Martinez Solis C. S./Navarro M. F. | 1:2 (7:5, 3:6, 6:10) | details | 26.10.2024 |
| Quarter-finals | Nava Elkin A. C./Van Poppel E. | Jara S./Usui K. | 0:2 (2:6, 3:6) | details | 25.10.2024 |
| 1/8-finals | Jara S./Usui K. | Alcobe Garibay R./Lara Cruz E. | 2:0 (7:5, 6:0) | details | 23.10.2024 |
Mexico: W15 Huamantla - Doubles - Main |
| Quarter-finals | Jara S./Usui K. | Rapolu M./Varul L. | 0:2 (5:7, 3:6) | details | 17.10.2024 |
| 1/8-finals | Jara S./Usui K. | Senties X./Ukaegbu A. | 2:0 (6:0, 6:1) | details | 16.10.2024 |