Kyung Mi Chang defeated Seiko Okamoto 6-2 6-3 in the Kugayama 10K round of 16 on hard. The upset overturned the form book — Seiko Okamoto came in leading the head-to-head 1–0. Kyung Mi Chang claimed a first win over Seiko Okamoto in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2007-05-07 | Gimcheon 25K | R32 | hard | Seiko Okamoto | 7-6(3) 4-6 6-2 |