Lewis Hamilton was fastest from Sebastian Vettel in qualifying for Sunday's Brazilian Grand Prix - but both drivers could face grid penalties for infringements during the session.
Hamilton's lap record of 1 minute, 07.281 seconds at the Interlagos circuit in Sao Paulo saw him edge out Vettel.
But Hamilton, who has already wrapped up the drivers' championship, could be investigated by stewards after he blocked both Sergey Sirotkin and Kimi Raikkonen during the second part of the session.
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Vettel will talk to stewards after an incident at the weighbridge as he returned to the pits in his Ferrari, again during the second part of the session.
Hamilton's Mercedes-GP teammate Valtteri Bottas was third, ahead of Raikkonen's Ferrari.
The Red Bull Racing cars of Max Verstappen and Daniel Ricciardo complete the third row.
Mercedes can clinch their fifth successive constructors' championship in Sunday's race. If Ferrari do not out-score them by at least 13 points then the trophy goes to the German marque.
The 71-lap race starts at 9.10pm UAE time.
