Lewis Hamilton made it a clean sweep as he topped the third and final practice session ahead of the United States Grand Prix at the Circuit of the Americas.
Hamilton, fastest in both sessions on Friday, jumped to the head of the standings late on with a time of 1:37.107 to end practice eight tenths of a second clear of his struggling Mercedes team-mate and title rival Nico Rosberg.
A seemingly unsettled Rosberg, who suffered from a glazed brake throughout the hour-long session, had seemed set to close the gap late on, before producing a scruffy final sector, staying second.
The two Williams cars were third and fourth, Felipe Massa ahead of Valtteri Bottas, but over a second down on Hamilton’s session topping time.
Fernando Alonso, who briefly topped the session with his opening run on the soft tyres, was fifth for Ferrari, ahead of Daniel Ricciardo, who topped the early running on the medium tyres, and Force India’s Nico Hulkenberg.
Adrian Sutil was a promising eighth for Sauber, while Kimi Raikkonen and Jenson Button rounded out the top 10.
Sebastian Vettel, who will start Sunday’s race from the pitlane after an engine change, was just 18th fastest as he concentrated on long runs.
Image courtesy of Daimler