Coco Vandeweghe defeated Andrea Petkovic 3-6 6-4 6-0 in the GER vs USA round robin on hard. The upset overturned the form book — Andrea Petkovic came in leading the head-to-head 3–0. Coco Vandeweghe claimed a first win over Andrea Petkovic in four meetings, narrowing the head-to-head to 3–1.
Vandeweghe C. came through in three sets.
Vandeweghe C. and Petkovic A. faced 13 of the same opponents in the last 12 months. Vandeweghe C. went 8–7 (53%) against them, Petkovic A. 7–8 (47%). Results against comparable opponents are close (3 : 5 better-results split).
Hard: Petkovic A. leads 2–1 · Grass: Petkovic A. leads 1–0
Coco Vandeweghe beat Andrea Petkovic 3-6 6-4 6-0. Umpiry, "Coco Vandeweghe vs Andrea Petkovic — GER vs USA Round Robin", https://umpiry.com/match/2017-02-11/petkovic-vs-vandeweghe-ger-vs-usa-rr?utm_source=cite (as of 11 February 2017).