Ai Yamamoto defeated Qiang Wang 4-6 6-4 7-6 in the Noto 25K round of 32 on carpet. The upset overturned the form book — Qiang Wang came in leading the head-to-head 1–0. Ai Yamamoto claimed a first win over Qiang Wang in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-08-31 | Tsukuba 25K | R32 | hard | Qiang Wang | 6-3 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.