Seiko Okamoto defeated Chiaki Nakajima 6-2 7-5 in the Haibara 10K round of 32 on carpet. The result followed the form book — Seiko Okamoto came in leading the head-to-head 1–0. Seiko Okamoto extended the head-to-head to 2–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-09-07 | Kugayama 4 10K | R32 | hard | Seiko Okamoto | 6-4 3-6 6-3 |