Chiaki Okadaue defeated Shiho Akita 6-2 7-6 in the Kofu $10K qualifying round on hard. The upset overturned the form book — Shiho Akita came in leading the head-to-head 1–0, but Chiaki Okadaue had been the form player, winning 3 of their last 6 on hard. Chiaki Okadaue claimed a first win over Shiho Akita in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-04-20 | Changwon 25K | R32 | hard | Shiho Akita | 6-2 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.