Aki Yamasoto defeated Shiho Akita 7-5 5-7 6-3 in the Makinohara 25K round of 32 on grass. The upset overturned the form book — Shiho Akita came in leading the head-to-head 1–0. Aki Yamasoto claimed a first win over Shiho Akita in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2010-09-20 | Makinohara 25K | R32 | carpet | Shiho Akita | 6-4 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.