George Russell was pipped for sprint pole in Austin by barely a hundredth of a second on Friday evening, Max Verstappen breaking Mercedes hearts with a brilliant late lap to go top of the times.
Verstappen's title challenger Lando Norris could only put his McLaren fourth, handing the advantage to the reigning champion in an important psychological blow.
Oscar Piastri fell victim to track limits at the Circuit of the Americas in the first part of sprint qualifying on Friday, getting dumped out of the session at the first opportunity.
Sergio Perez followed the McLaren out in SQ2, albeit simply for lack of pace rather than due to any track limits issues.