K. Usui is a WTA tennis player. Current hard-court ELO 1163 (5-11). Recent form: 5-10 over the last 15 matches.
| Date | | Opponent | Score | Event |
|---|
| Nov. 5, 2025 |
W |
Z. Kudlackova |
2 - 1 |
ITF W15 Lincoln 2 Women · hard |
| Oct. 22, 2025 |
L |
A. Shcherbinina |
2 - 1 |
W35 Norman, OK · hard |
| Aug. 13, 2025 |
L |
H. Giavara |
1 - 2 |
W50 Saskatoon · hard |
| Aug. 11, 2025 |
W |
J. Burrage |
0 - 2 |
W50 Saskatoon · hard |
| July 8, 2025 |
L |
C. McNeil |
1 - 2 |
W15 San Diego, CA 4 · hard |
| July 3, 2025 |
L |
O. Bergler |
2 - 1 |
W15 Los Angeles, CA · hard |
| July 2, 2025 |
W |
E.-T. Cadar |
2 - 0 |
W15 Los Angeles, CA · hard |
| June 11, 2025 |
L |
B. Walker |
1 - 2 |
W35 Decatur, IL · hard |
| April 1, 2025 |
L |
A. Miyamoto |
2 - 0 |
W15 Kashiwa · hard |
| March 12, 2025 |
L |
R. Lacasse |
2 - 0 |
W15 Montreal · hard |
| March 4, 2025 |
L |
J. Robinson |
0 - 2 |
W15 Trois-Rivieres · hard |
| Oct. 25, 2024 |
L |
Y. Monroy |
2 - 0 |
ITF W15 Huamantla 2 Women · hard |
| Oct. 24, 2024 |
W |
C. E. Lara |
0 - 2 |
ITF W15 Huamantla 2 Women · hard |
| Oct. 23, 2024 |
W |
E. Van Poppel |
2 - 0 |
ITF W15 Huamantla 2 Women · hard |
| Oct. 15, 2024 |
L |
M. Rapolu |
2 - 0 |
ITF W15 Huamantla Women · hard |