Ying Ying Duan defeated Shuai Zhang 5-7 6-3 7-5 in the Suzhou 100K qualifying round on hard. The upset overturned the form book — Shuai Zhang came in leading the head-to-head 1–0. Ying Ying Duan claimed a first win over Shuai Zhang in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-06-29 | Xiamen 25K | F | hard | Shuai Zhang | 6-2 6-1 |
Averages over each player's completed matches in the selected window (160 vs 200). ATP, WTA & Challenger.
Zhang S.: 6 days rest · 2 matches, 45 games (7d). Higher means fresher. About
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About
Per-surface Serve / Return Rating (0–100, percentile within the hard field, opponent-adjusted over 52 weeks). About