Lewis Hamilton was quickest once more in third practice for the United States Grand Prix.
It wasn’t completely plain sailing for the championship leader who suffered a spin at turn 12 during the session, but he recovered to top the times and complete a clean-sweep of the free practice running in Austin.
Hamilton’s flying lap of 1m37.107s was set inside the final ten minutes of the session, and saw him finish up 0.883s clear of his Mercedes team-mate and world title rival Nico Rosberg.
Rosberg struggled with brake problems during the session and was unable to post a quick lap until the final minutes, but did at least get himself up into P2.
Williams were firmly best-of-the-rest behind the two Mercedes cars, with Felipe Massa beating his team-mate Valtteri Bottas to third place.
Fernando Alonso was fifth in his Ferrari ahead of Red Bull ace Daniel Ricciardo. Nico Hulkenberg took seventh for Force India, just ahead of fellow German Adrian Sutil, who was a fine eighth in his Sauber.
Kimi Raikkonen was ninth, while Jenson Button edged out his McLaren team-mate Kevin Magnussen by less than a tenth of a second for the final spot in the top ten.
Pastor Maldonado was the quicker of the Lotus pair with 12th ahead of Romain Grosjean and the second Force India of Sergio Perez, while the Toro Rosso duo of Daniil Kvyat and Jean-Eric Vergne finished up in 15th and 17th respectively, split by Esteban Gutierrez.
Sebastian Vettel again propped up the 18-car field as he focussed on race runs ahead of his enforced pitlane start for using a sixth power unit.