Sakiko Shimizu defeated Ayumi Oka 7-5 6-3 in the Saitama 10K round of 32 on hard. The upset overturned the form book — Ayumi Oka came in leading the head-to-head 1–0. Sakiko Shimizu claimed a first win over Ayumi Oka in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-07-07 | Tokyo 10K | QF | carpet | Ayumi Oka | 2-6 6-4 6-1 |