Ayumi Koshiishi defeated Patcharin Cheapchadej 6-3 1-6 6-1 in the W15 Hua Hin 2 semi-final on hard. The upset overturned the form book — Patcharin Cheapchadej came in leading the head-to-head 1–0. Ayumi Koshiishi claimed a first win over Patcharin Cheapchadej in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2019-10-10 | W15 Hua Hin 3 | R16 | hard | Patcharin Cheapchadej | 6-1 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.