Hikaru Sato defeated Ayumi Koshiishi 6-4 6-4 in the W15 Nakhon Si Thammarat 4 final on hard. Hikaru Sato claimed a first win over Ayumi Koshiishi in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2025-09-03 | W35 Nakhon Pathom 3 | R32 | hard | Ayumi Koshiishi | 6-4 6-2 |
| 2025-05-14 | W35 Changwon 1 | R32 | hard | Ayumi Koshiishi | 6-2 6-2 |
Averages over each player's completed matches in the selected window (49 vs 44). 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