Naomi Osaka defeated Coco Vandeweghe 6-7 6-3 6-4 in the US Open round of 128 on hard. The upset overturned the form book — Coco Vandeweghe came in defending last year's round of 64.
Osaka N. came through in three sets.
Osaka N. and Vandeweghe C. faced 7 of the same opponents in the last 12 months. Osaka N. went 3–4 (43%) against them, Vandeweghe C. 4–3 (57%). Results against comparable opponents are close (1 : 2 better-results split).