Hamilton fastest, Verstappen 2nd, Vettel 3rd
Vettel spins, complaining of handling problems
Hamilton can win the world title on Sunday
Final practice at 17:00 BST on Saturday; qualifying at 22:00
Brendon Hartley was an encouraging 14th fastest in first practice, only to then be hit with a 25-place grid penalty because of engine-related issues before he joined Toro Rosso.
Image source, .Let's start with those drivers that have some grid penalties to deal with this weekend.
Championship leader Lewis Hamilton was, unsurprisingly, the fastest man in first practice. Can he do the same in session two? Let's find out.
Image source, Getty ImagesAnd that is the end of practice session one. Go and get some food and relax for a bit before we come back at 19:30 BST for session two.
Don't miss it. See you then.
Image source, Getty ImagesAndrew Benson's report from the opening session is here.
Lewis Hamilton set a searing pace as he dominates first practice at the United States Grand Prix.
The title leader's Mercedes was 0.593 seconds quicker than rival Sebastian Vettel's Ferrari, with Hamilton's team-mate Valtteri Bottas third.
Hamilton will clinch his fourth title on Sunday if he wins the race with Vettel lower than sixth.
But he has labelled this idea as "silly", saying he expects Ferrari will not have a fourth bad race in a row.
These are the full standings from the first practice session. Fernando Alonso was the only man not to set a time, because of a hydraulic leak.
His team-mate Stoffel Vandoorne fared much better, coming fifth. Carlos Sainz came 10th in his first session in the Renault. Brendon Hartley 14th fastest and I'm sure he will be happy with that.
Image source, .What a start to the weekend for Lewis Hamilton, who could end it with another world title.
Just like the drivers' championship standings, Hamilton is first, Sebastian Vettel second and Valtteri Bottas third.
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Image source, F1
Andrew Benson
BBC Sport’s chief F1 writer in Austin
FIA confirms 20-place grid penalty for Hulkenberg.
One minute to go. Lewis Hamilton leads from Sebastian Vettel with Valtteri Bottas third.
We haven't mentioned the Saubers yet, and they are where they normally are - at the back. Charles Leclerc is 19th, with Marcus Ericsson 18th. Going to be another long weekend for them.
Your first Formula 1 memories / memorable F1 debuts
Peter Tully: My first race was Melbourne 09, a certain @JensonButton, external turned up in his last-minute Brawn and made the established look silly!
Paul Harris: Eddie Irvine Japanese GP 1993. Unlaps himself from the legend Aryton Senna and gets a swift right for the privilege.
Image source, Getty ImagesWe weren't expecting to see Fernando Alonso in this session, but he comes out of the pits, but it is only a fleeting sight of the Spaniard as he soon is pushed back in.
Hopefully, he will be able to take full part in the second session, which gets going at 20:00 BST.
The fastest cars at this moment are the Force Indias, apparently.
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It is the home race for the Haas team, the only American team in Formula 1. At the moment their fans will be hoping for better than what Romain Grosjean and Kevin Magnussen have served up so far today.
Magnussen is only 15th fastest and Grosjean 16th fastest, with only 19 men setting a time with McLaren's Fernando Alonso not taking part in the session because of a hydraulic leak.
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Lewis Hamilton has dominated recently. There are signs he could do so again this weekend.
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Brendon Hartley is 12th quickest, a pretty decent attempt on his debut. He is complaining about his race helmet needing changed, but is told there is no time for that so out he stays.
Eighteen minutes to go in this first practice session.
This is how they stand at the moment...
Image source, .Your first Formula 1 memories / memorable F1 debuts
Tim Robinson: First GP 1967 British GP with my Dad and brother. Jim Clark won in the new Lotus 49.
James Woods: Abu Dhabi 2012, Vettel's comeback from a pit lane start and Kimi winning in the Lotus.
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Lee, you old romantic.
Felipe Massa moves on to the ultra-softs as well and instantly jumps up to fourth. It is a Mercedes one two so far, with Hamilton ahead of Bottas.
A few drivers have opted to use the ultrasofts, which you will have seen have changed colour. Gone is the usual purple, replaced by pink as Formula 1 raises publicity for Breast Cancer Awareness Month.
Lance Stroll is the fastest of those who have gone on the ultrasofts - seventh quickest so far.
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