Ayaka Maekawa defeated Ayumi Oka 6-3 6-3 in the Pingguo 25K round of 32 on hard. The upset overturned the form book — Ayumi Oka came in leading the head-to-head 2–0. Ayaka Maekawa claimed a first win over Ayumi Oka in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-06-16 | Sutama 10K | QF | clay | Ayumi Oka | 1-6 7-5 6-4 |
| 2007-09-03 | Kyoto 10K | R16 | carpet | Ayumi Oka | 6-4 6-7(3) 6-1 |