Qiang Wang defeated Ai Yamamoto 6-3 6-4 in the Tsukuba 25K round of 32 on hard. The upset overturned the form book — Ai Yamamoto came in leading the head-to-head 1–0. Qiang Wang claimed a first win over Ai Yamamoto in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-09-07 | Noto 25K | R32 | carpet | Ai Yamamoto | 4-6 6-4 7-6(3) |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.