Nicha Lertpitaksinchai defeated Ai Yamamoto 7-5 7-6 in the Kyoto 10K round of 32 on carpet. The upset overturned the form book — Ai Yamamoto came in leading the head-to-head 1–0. Nicha Lertpitaksinchai claimed a first win over Ai Yamamoto in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-06-22 | Bangkok 10K | R16 | hard | Ai Yamamoto | 7-6(5) 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.