Sung Hee Han defeated Ai Yamamoto 6-1 6-2 in the Bangkok 10K round of 16 on hard. The upset overturned the form book — Ai Yamamoto came in leading the head-to-head 1–0. Sung Hee Han claimed a first win over Ai Yamamoto in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-07-13 | Miyazaki 10K | R16 | carpet | Ai Yamamoto | 6-4 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.