Pole for the Austin race is decided on Saturday night.
Qualifying runs 10pm to 11pm UK time on Saturday.
The Ferrari driver topped both practice sessions in Austin.
Antonelli was second in practice two, a fraction behind Leclerc.
Verstappen was 0.189 seconds back, with Hamilton fourth.
Norris was seventh and Piastri eighth after messy fast laps.
A win on Sunday could make him world champion.
Russell must finish ninth or lower, and Hamilton outside the top four.
Austin hits 30C for qualifying, with a gentle breeze.
Lights out is 8pm GMT on Sunday, 1am PKT on Monday.
Ferrari, Mercedes, Red Bull and McLaren can all take pole.
Read the full explainer on Rive News for every session time.
Get the full breakdown, key numbers, and what happens next.
Read on Rive News