Thuy Dung Nguyen defeated Seiko Okamoto 6-4 6-3 in the Nonthaburi 10K round of 32 on hard. The upset overturned the form book — Seiko Okamoto came in leading the head-to-head 1–0. Thuy Dung Nguyen claimed a first win over Seiko Okamoto in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2007-04-09 | Ho Chi Minh City 25K | R32 | hard | Seiko Okamoto | 6-3 6-1 |