Serena Williams defeated Naomi Osaka 6-3 6-4 in the Toronto quarter-final on hard. The upset overturned the form book — Naomi Osaka came in ranked #17, leading the head-to-head 2–0. Serena Williams claimed a first win over Naomi Osaka in three meetings, narrowing the head-to-head to 2–1.
Williams S. took it in straight sets.
Williams S. and Osaka N. faced 7 of the same opponents in the last 12 months. Williams S. went 6–2 (75%) against them, Osaka N. 8–2 (80%). Results against comparable opponents are close (1 : 1 better-results split).
Serena Williams beat Naomi Osaka 6-3 6-4. Umpiry, "Serena Williams vs Naomi Osaka — Toronto Quarter-final", https://umpiry.com/match/2019-08-05/osaka-vs-williams-toronto-qf?utm_source=cite (as of 5 August 2019).