Honoka Kobayashi defeated Ayumi Koshiishi 7-6 6-4 in the W100 Takasaki 1 qualifying round of 32 on hard. The upset overturned the form book — Ayumi Koshiishi came in ranked #771, leading the head-to-head 2–0. Honoka Kobayashi claimed a first win over Ayumi Koshiishi in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2024-11-24 | W50 Yokohama 1 | Q32 | hard | Ayumi Koshiishi | 7-5 1-6 6-2 |
| 2019-06-19 | W15 Gimcheon 2 | R32 | hard | Ayumi Koshiishi | 4-6 6-4 6-4 |
Averages over each player's completed matches in the selected window (116 vs 154). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About