H. S. Koay is a ATP tennis player. Recent form: 4-3 over the last 7 matches.
| Date | Opponent | Score | Event | |
|---|---|---|---|---|
| Aug. 13, 2022 | W | A. Al Janahi | 2 - 0 | ATP Davis Cup - Group III |
| Aug. 12, 2022 | W | M. Alkotop | 0 - 2 | ATP Davis Cup - Group III |
| Aug. 11, 2022 | L | P. V. Nguyen | 2 - 1 | ATP Davis Cup - Group III |
| Aug. 10, 2022 | W | M. Salim | 0 - 2 | ATP Davis Cup - Group III |
| Sept. 18, 2021 | L | L. G. Trinh | 2 - 0 | ATP Davis Cup - Group III |
| Sept. 17, 2021 | W | A. Mubarak | 1 - 2 | ATP Davis Cup - Group III |
| Sept. 15, 2021 | L | C. Wong | 2 - 0 | ATP Davis Cup - Group III |