Polona Hercog defeated Shuai Zhang 6-2 6-2 in the Marrakech round of 32 on clay. The upset overturned the form book — Shuai Zhang came in ranked #57.
Hercog P. took it in straight sets.
Hercog P. and Zhang S. faced 5 of the same opponents in the last 12 months. Hercog P. went 5–1 (83%) against them, Zhang S. 2–4 (33%). Hercog P. came out better against 2 of 3 comparable opponents, Zhang S. against 0 — though 1 of those edges carries caveats (retirement).
Polona Hercog beat Shuai Zhang 6-2 6-2. Umpiry, "Polona Hercog vs Shuai Zhang — Marrakech Round of 32", https://umpiry.com/match/2014-04-23/hercog-vs-zhang-marrakech-r32?utm_source=cite (as of 23 April 2014).