Kanae Hisami defeated Ayumi Oka 5-7 6-3 6-2 in the Nagano 25K round of 32 on carpet. The upset overturned the form book — Ayumi Oka came in leading the head-to-head 1–0. Kanae Hisami claimed a first win over Ayumi Oka in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-07-07 | Tokyo 10K | R16 | carpet | Ayumi Oka | 7-5 6-0 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.