Anastasia Pavlyuchenkova defeated Kai Chen Chang 6-4 6-4 in the Washington quarter-final on hard.
Pavlyuchenkova A. took it in straight sets.
Pavlyuchenkova A. and Chen Chang K. faced 4 of the same opponents in the last 12 months. Pavlyuchenkova A. went 3–3 (50%) against them, Chen Chang K. 1–4 (20%). Pavlyuchenkova A. came out better against 2 of 3 comparable opponents, Chen Chang K. against 0.
Only 4 common opponents — small sample, treat as indicative.
Anastasia Pavlyuchenkova beat Kai Chen Chang 6-4 6-4. Umpiry, "Anastasia Pavlyuchenkova vs Kai Chen Chang — Washington Quarter-final", https://umpiry.com/match/2012-07-30/chang-vs-pavlyuchenkova-washington-qf?utm_source=cite (as of 30 July 2012).