Seiko Okamoto advanced past Elena Baltacha via walkover in the Hamanako 25K qualifying round. Seiko Okamoto narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-04-20 | Changwon 25K | QF | hard | Elena Baltacha | 6-1 6-1 |
| 2007-10-15 | Makinohara 25K | SF | carpet | Seiko Okamoto | 6-3 6-4 |
| 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.