Seiko Okamoto defeated Elena Baltacha 6-3 6-4 in the Makinohara 25K semi-final on carpet. The upset overturned the form book — Elena Baltacha came in leading the head-to-head 2–0. Seiko Okamoto claimed a first win over Elena Baltacha in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-04-20 | Changwon 25K | QF | hard | Elena Baltacha | 6-1 6-1 |
| 2007-05-07 | Gimcheon 25K | R16 | hard | Elena Baltacha | 6-4 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.