Noppawan Lertcheewakarn defeated Sachie Ishizu 7-5 6-7 6-2 in the Tsukuba $25K round of 16 on hard. The upset overturned the form book — Sachie Ishizu came in leading the head-to-head 1–0. Noppawan Lertcheewakarn claimed a first win over Sachie Ishizu in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-10-05 | Tokyo 100K | R32 | hard | Sachie Ishizu | 6-1 7-5 |