Polona Hercog defeated Jie Zheng 7-5 6-4 in the New Haven qualifying round 1 on hard.
Hercog P. took it in straight sets.
Hercog P. and Zheng J. faced 4 of the same opponents in the last 12 months. Hercog P. went 4–1 (80%) against them, Zheng J. 2–2 (50%). Only 2 of the comparisons are context-comparable — too few for a conclusion.
Only 4 common opponents — small sample, treat as indicative.