Miyu Kato defeated Maya Kato 6-3 7-5 in the Karuizawa 25K q32 on grass. The upset overturned the form book — Maya Kato came in leading the head-to-head 1–0. Miyu Kato claimed a first win over Maya Kato in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-09-14 | Kyoto 10K | R32 | carpet | Maya Kato | 6-4 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.