Ayaka Maekawa defeated Mayumi Yamamoto 6-4 7-6 in the Kofu 10K final on hard. The upset overturned the form book — Mayumi Yamamoto came in leading the head-to-head 2–0. Ayaka Maekawa claimed a first win over Mayumi Yamamoto in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-09-04 | Kyoto 10K | SF | carpet | Mayumi Yamamoto | 6-1 6-3 |
| 2005-05-23 | Nagano 25K | SF | carpet | Mayumi Yamamoto | 0-6 6-4 6-4 |