F1 world championship leader Max Verstappen's laid down a marker for the Qatar Grand Prix by setting the fastest pace in first practice.
His title rival Lewis Hamilton - who boosted his chances of retaining the trophy with victory in Brazil - was only fourth quickest.
Alpha Tauri's Pierre Gasly was second, with Hamlton's Mercedes team-mate Valtteri Bottas third.
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Meanwhile, Formula One stewards have denied Mercedes a further review into the decision not to penalise Max Verstappen at last weekend's Sao Paolo Grand Prix.
The Red Bull driver - who leads the drivers' championship by 14 points - was involved in an incident with title rival Lewis Hamilton of Mercedes.
