Sloane Stephens defeated Daria Kasatkina 6-1 5-7 7-5 in the Charleston quarter-final on clay. The upset overturned the form book — Daria Kasatkina came in ranked #87.
Stephens S. came through in three sets.
Stephens S. and Kasatkina D. faced 8 of the same opponents in the last 12 months. Stephens S. went 6–4 (60%) against them, Kasatkina D. 5–3 (63%). Results against comparable opponents are close (1 : 1 better-results split).
Sloane Stephens beat Daria Kasatkina 6-1 5-7 7-5. Umpiry, "Sloane Stephens vs Daria Kasatkina — Charleston Quarter-final", https://umpiry.com/match/2016-04-08/kasatkina-vs-stephens-charleston-qf?utm_source=cite (as of 8 April 2016).