Seiko Okamoto defeated Nami Urabe 7-5 6-4 in the Ibaraki 10K round of 32 on hard. 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 |
|---|---|---|---|---|---|
| 1998-10-05 | Saga 25K | R32 | grass | Seiko Okamoto | 6-2 7-5 |
| 1997-09-08 | Kugayama 4 10K | R32 | hard | Seiko Okamoto | 6-4 6-2 |