Erika Takao defeated Mayumi Yamamoto 7-5 7-6 in the Makinohara 25K round of 32 on carpet. The upset overturned the form book — Mayumi Yamamoto came in leading the head-to-head 2–0. Erika Takao claimed a first win over Mayumi Yamamoto in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2005-05-30 | Gunma 25K | R32 | carpet | Mayumi Yamamoto | 6-3 6-3 |
| 2004-06-21 | Inchon 25K | R32 | hard | Mayumi Yamamoto | 6-3 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.