Lewis Hamilton continued his impressive start to the United States Grand Prix weekend by leading the Formula 1 field in second practice on Friday afternoon, finishing almost four-tenths of a second clear at the Circuit of The Americas.

Four-time COTA winner Hamilton led a wet-dry opening practice on Friday morning before stretching the legs of his Mercedes W08 car in a dry FP2, setting a new track record in the process.

A fastest time of 1:34.668 on the ultra-soft tyre saw Hamilton finish 0.397 seconds clear of Red Bull rival Max Verstappen in the final timesheets, stamping his authority on proceedings early in the race weekend.

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Title rival Sebastian Vettel had a mixed session, completing just 11 laps due to an issue on his Ferrari SF70H car that limited his running, having run off the circuit and nearly beached his car early in the session.

Although Vettel was able to finish P3 and lap just half a second off Hamilton, after a recent spate of poor reliability, this latest setback will surely have set alarm bells off at Ferrari.

Valtteri Bottas struggled to match Hamilton in the second Mercedes car, finishing six-tenths of a econd back in P4 ahead of Red Bull's Daniel Ricciardo and Ferrari's Kimi Raikkonen.

Fernando Alonso led McLaren's charge with a solid run to P7 despite the power-hungry nature of the track playing against the team's strengths, with Williams' Felipe Massa taking P8. Force India drivers Sergio Perez and Esteban Ocon rounded out the top 10, separated by just 0.009 seconds.

Brendon Hartley continued to gain experienced ahead of his grand prix debut for Toro Rosso, finishing 17th overall, 1.3 seconds off the time set by teammate Daniil Kvyat, who returned for his first session since the Singapore Grand Prix.