Varatchaya Wongteanchai defeated Ai Yamamoto 6-1 6-0 in the Aurangabad 10K qualifying round on clay. The upset overturned the form book — Ai Yamamoto came in leading the head-to-head 3–0. Varatchaya Wongteanchai claimed a first win over Ai Yamamoto in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-06-22 | Bangkok 10K | F | hard | Ai Yamamoto | 6-1 6-1 |
| 2008-05-19 | Khonkan 10K | R16 | hard | Ai Yamamoto | 6-3 6-0 |
| 2008-05-12 | Bangkok 10K | R32 | hard | Ai Yamamoto | 7-5 2-6 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.