Chin Bee Khoo defeated Seiko Okamoto 6-4 7-6 in the Ho Chi Minh City 25K round of 16 on hard. The upset overturned the form book — Seiko Okamoto came in leading the head-to-head 1–0. Chin Bee Khoo claimed a first win over Seiko Okamoto in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2003-07-07 | Vancouver 25K | R32 | hard | Seiko Okamoto | 6-3 6-2 |