Krittin Koaykul defeated Casey Ambler 3-6 6-3 10-7 in the M15 Nakhon Pathom 1 q32 on hard. The result followed the form book — Krittin Koaykul came in leading the head-to-head 1–0. Krittin Koaykul extended the head-to-head to 2–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2025-07-28 | M15 Nakhon Pathom 3 | Q16 | hard | Krittin Koaykul | 6-4 6-2 |