Seiko Okamoto defeated Tomoyo Takagishi 6-4 6-7 7-5 in the Gunma 25K round of 32 on carpet. The result followed the form book — Seiko Okamoto came in leading the head-to-head 2–0. Seiko Okamoto extended the head-to-head to 3–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-05-18 | Nagano 25K | R32 | carpet | Seiko Okamoto | 5-7 6-1 6-3 |
| 2007-04-09 | Ho Chi Minh City 25K | SF | hard | Seiko Okamoto | 6-2 3-6 7-6(2) |