Christian Horner said Max Verstappen and Sergio Perez's hopes of pole position were thwarted by Yuki Tsunoda's mistake at the end of qualifying.
Tsunoda, who drives for Red Bull junior team AlphaTauri, ran wide through the middle sector of the Mexico City circuit and drove slowly along a run-off area which runs adjacent to the track. Tsunoda's moment distracted Perez and saw him go wide at the same part of the track.
Verstappen was the next car through that part of the circuit and although he avoided making a similar mistake, he clearly had his rhythm disrupted through one of the hardest parts of the lap.