Ayumi Oka defeated Kanae Hisami 7-5 6-0 in the Tokyo 10K round of 16 on carpet. The upset overturned the form book — Kanae Hisami came in leading the head-to-head 1–0. Ayumi Oka claimed a first win over Kanae Hisami in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-05-22 | Nagano 25K | R32 | carpet | Kanae Hisami | 5-7 6-3 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.