Karin Knapp defeated Polona Hercog 6-2 6-1 in the New Haven qualifying round 2 on hard. Karin Knapp moved ahead in the head-to-head, 2–1.
Knapp K. took it in straight sets.
Knapp K. and Hercog P. faced 4 of the same opponents in the last 12 months. Knapp K. went 3–1 (75%) against them, Hercog P. 3–2 (60%). Knapp K. came out better against 2 of 3 comparable opponents, Hercog P. against 0 — though 1 of those edges carries caveats (lower-tier event).
Only 4 common opponents — small sample, treat as indicative.
Karin Knapp beat Polona Hercog 6-2 6-1. Umpiry, "Karin Knapp vs Polona Hercog — New Haven Qualifying Round 2", https://umpiry.com/match/2014-08-18/hercog-vs-knapp-new-haven-q2?utm_source=cite (as of 18 August 2014).