Kai Lin Zhang defeated Ying Ying Duan 6-4 6-2 in the Quanzhou $50K round of 16 on hard. The upset overturned the form book — Ying Ying Duan came in leading the head-to-head 4–1. Kai Lin Zhang narrowed the head-to-head to 4–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2015-10-19 | Suzhou $50K | F | hard | Kai Lin Zhang | 1-6 6-3 6-4 |
| 2013-04-22 | Wenshan 50K | QF | hard | Ying Ying Duan | 6-3 6-3 |
| 2012-05-28 | Gimcheon 25K | R16 | hard | Ying Ying Duan | 6-2 6-4 |
| 2012-01-02 | Quanzhou 50K | R32 | hard | Ying Ying Duan | 6-1 6-2 |
| 2010-03-29 | Nanjing 10K | SF | hard | Ying Ying Duan | 6-3 6-1 |
Averages over each player's completed matches in the selected window (61 vs 124). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About