Alison Riske defeated Coco Vandeweghe 6-4 6-4 in the Dubai round of 64 on hard. The upset overturned the form book — Coco Vandeweghe came in defending last year's quarter-final.
Riske A. took it in straight sets.
Riske A. and Vandeweghe C. faced 6 of the same opponents in the last 12 months. Riske A. went 2–4 (33%) against them, Vandeweghe C. 6–1 (86%). Vandeweghe C. came out clearly better against 4 of 5 comparable opponents, Riske A. against 1 — though 1 of those edges carries caveats (lower-tier event).
Alison Riske beat Coco Vandeweghe 6-4 6-4. Umpiry, "Alison Riske vs Coco Vandeweghe — Dubai Round of 64", https://umpiry.com/match/2017-02-20/riske-vs-vandeweghe-dubai-r64?utm_source=cite (as of 20 February 2017).