Seiko Okamoto defeated Thuy Dung Nguyen 6-3 6-1 in the Ho Chi Minh City 25K round of 32 on hard. The upset overturned the form book — Thuy Dung Nguyen came in leading the head-to-head 1–0. Seiko Okamoto claimed a first win over Thuy Dung Nguyen in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-08-25 | Nonthaburi 10K | R32 | hard | Thuy Dung Nguyen | 6-4 6-3 |