Petra Kvitova defeated Madison Keys 7-5 6-4 in the Cincinnati round of 64 on hard. The upset overturned the form book — Madison Keys came in leading the head-to-head 4–3, defending last year's round of 32. That levelled the head-to-head at 4–4.
Kvitova P. took it in straight sets.
Kvitova P. and Keys M. faced 7 of the same opponents in the last 12 months. Kvitova P. went 6–1 (86%) against them, Keys M. 3–6 (33%). Kvitova P. came out better against 4 of 7 comparable opponents, Keys M. against 1 — though 1 of those edges carries caveats (retirement).
Hard: Kvitova P. leads 4–3 · Clay: Keys M. leads 1–0
Petra Kvitova beat Madison Keys 7-5 6-4. Umpiry, "Petra Kvitova vs Madison Keys — Cincinnati Round of 64", https://umpiry.com/match/2021-08-16/keys-vs-kvitova-cincinnati-r64?utm_source=cite (as of 16 August 2021).