Riei Kawamata defeated Seiko Okamoto 6-2 6-2 in the Qing Dao 25K round of 32 on hard. The upset overturned the form book — Seiko Okamoto came in leading the head-to-head 2–0. Riei Kawamata claimed a first win over Seiko Okamoto in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2000-11-13 | Haibara 10K | R16 | clay | Seiko Okamoto | 2-4 4-2 4-2 4-2 |
| 1998-09-07 | Kugayama 1 10K | R16 | hard | Seiko Okamoto | 6-2 6-1 |