Seiko Okamoto defeated Chin Bee Khoo 6-3 6-2 in the Vancouver 25K round of 32 on hard. The upset overturned the form book — Chin Bee Khoo came in leading the head-to-head 1–0. Seiko Okamoto claimed a first win over Chin Bee Khoo in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2003-04-14 | Ho Chi Minh City 25K | R16 | hard | Chin Bee Khoo | 6-4 7-6(4) |