Austin: Lewis Hamilton said he had to lie down and recover from a "massive headache" caused by the bumpy track before he topped second practice at the United States Grand Prix on Friday. Hamilton, 34, who is poised to clinch his sixth drivers' world title on Sunday, said the Circuit of the Americas was "the bumpiest track by far that I have ever been on." Several other drivers also complained as they struggled with the uneven surface including nearest rival Charles Leclerc of Ferrari who wound up second fastest by three-tenths of a second.

Hamilton said he "was not feeling good" because of the bumps after opening practice, topped by Red Bull's Max Verstappen who was third-quickest in the second session. "It was the bumpiest track by far that I have ever been on - I had such a headache," said Hamilton who needs only to finish in the top eight to retain his title.