Sloane Stephens defeated Magda Linette 6-2 6-4 in the USA vs POL round robin on hard. The upset overturned the form book — Magda Linette came in ranked #80, but Sloane Stephens had been the form player, winning 4 of their last 8 on hard. Sloane Stephens extended the head-to-head to 2–0.
Stephens S. took it in straight sets.
Stephens S. and Linette M. faced 4 of the same opponents in the last 12 months. Stephens S. went 2–2 (50%) against them, Linette M. 2–5 (29%). Results against comparable opponents are close (2 : 1 better-results split).
Only 4 common opponents — small sample, treat as indicative.
Sloane Stephens beat Magda Linette 6-2 6-4. Umpiry, "Sloane Stephens vs Magda Linette — USA vs POL Round Robin", https://umpiry.com/match/2016-02-06/linette-vs-stephens-usa-vs-pol-rr?utm_source=cite (as of 6 February 2016).