Carlos Sainz led Charles Leclerc successful a Ferrari one-two successful archetypal signifier astatine the Mexican Grand Prix arsenic 0.2 seconds separated the apical six drivers.
Sainz was 0.047 seconds up of his team-mate astatine the Autodromo Hermanos Rodriguez successful Mexico City.
The Red Bulls of Sergio Perez and Max Verstappen were next, followed by Lewis Hamilton's Mercedes and Fernando Alonso's Alpine.
Verstappen had a rotation astatine the Esses but managed to enactment retired of the barriers.
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The satellite champion besides had an oversteer infinitesimal astatine Turn Five aboriginal successful the league arsenic helium struggled connected the low-grip track.
Perez and Verstappen, who acceptable identical times to the thousandth of a second, were 0.12secs down Sainz, with Hamilton 0.142secs disconnected the gait and Alonso 0.192secs behind.
Alfa Romeo's Valtteri Bottas, McLaren's Lando Norris, Alpha Tauri's Pierre Gasly and Aston Martin's Sebastian Vettel completed the apical 10.
A fig of teams utilized young drivers successful the league to fulfil their obligations nether the rules.
The quickest was Liam Lawson successful the Alpha Tauri successful 16th place, followed by Williams' Logan Sargeant, Mercedes' Nick De Vries, Alpine's Mick Doohan and Haas operator Pietro Fittipaldi.
Lawson, Doohan and Fittipaldi each had their sessions curtailed by method problems.
Both Fittialdi's and Lawson's issues led to the league being stopped, and Lawson's was adjacent capable to the extremity of the hr for it not to beryllium resumed.
The 2nd session, which starts astatine 22:00 UK clip and runs for 90 minutes, volition beryllium devoted to investigating 2023 Pirelli tyres, arsenic was the lawsuit successful Austin past weekend.
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