It's victory for Lewis Hamilton in the first of four mini battles. It's Mexico next, where Nico Rosberg won last year. A repeat of that and a disastrous weekend for Hamilton and Rosberg could well be celebrating his first world title.
That's it from us, I'll leave you with Andrew Benson's take on the United States Grand Prix. Mexican GP first practice gets under way on Friday, see you then.
'Very disappointed'
Max VerstappenCopyright: Max Verstappen
'First half fun, second half boring'
McLaren's Jenson Button climbed his way into the points and told Sky Sports: "It was a fun race, 19th to ninth is not too bad. The first half of the race was fun, the second was a bit boring."
Hamilton's memorable moment
BBC Radio 5 live
Listen again to the moment Lewis Hamilton won a grand prix for the 50th time.
Video content
Video caption: Lewis Hamilton wins in Austin to close the gap in the drivers' championship.Lewis Hamilton wins in Austin to close the gap in the drivers' championship.
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Getty ImagesCopyright: Getty Images
Lewis Hamilton's victory is his fourth in five races at the Circuit of the Americas but his fifth overall at the United States Grand Prix, moving him level with Michael Schumacher on the all-time list.
Not much in it
.Copyright: .
Incredible scenes here in what is the closest vote result I have ever seen on a page I've worked on. We kicked off our coverage with the question: Should F1 bosses have outlawed moving under braking? 51% of you said no it shouldn't.
Hamilton 'down on power'
That win looked comfortable for Lewis Hamilton, but he suggests it was anything but.
The Briton has just told Sky Sports that he was down on power on Nico Rosberg.
"It would have cost me about two seconds," he says.
"It has been a long time coming and it feels even more special. It has been long, hard slog so it feels great."
'My fault, not very clever'
Red Bull's Max Verstappen surprised his team by coming in for an unwanted pit stop before a gear box failure ended his race prematurely.
He tells Sky Sports: "As a racer you always want to go forward. They said save your tyres and I was like 'I want to go forward'. The pace was good and I could easily follow the guys in front.
"I backed off a bit to save my tyres. They told me to push and I thought it was an indication to box and then realised they didn't box me. It was my fault, not very clever. In the end it did not matter."
On where he stopped, which caused the virtual safety car to come out, a situation that inadvertently cost team-mate Daniel Riccardo second place, Verstappen adds: "The team told me to keep on going, I said there was a serious issue, then they said stop there."
Timo's loving Ricciardo's antics
'P4 was the maximum we could do'
Quotes from the Ferrari duo, with Sebastian Vettel coming fourth and Kimi Raikkonen failing to finish.
Vettel tells Sky Sports: "The car was better today than yesterday and we were a match for Red Bull for the majority of the race. It was a decent day, just a shame we could not get both cars to the finish. P4 was the maximum we could get today."
Raikkonen adds: "We had some issue with the pit stop and the tyre was not tight 100%. The car was behaving pretty good but that does not matter as we didn't finish the race and it was one of those weekends.
"The wheel was attached somehow, but there was something going on and I slowed down as I saw some sparks. I don't know why it was not done 100%."
Drivers' standings
F1.comCopyright: F1.com
Championship leader Nico Rosberg has 331 points, 26 more than Lewis Hamilton. Meanwhile, Fernando Alonso is up into the top 10 after his impressive fifth-place finish.
Hamilton's half century
Getty ImagesCopyright: Getty Images
BBCCopyright: BBC
Lewis Hamilton's 50th race win came in his 185th grand prix.
We've taken a look at the key stats behind Hamilton's race wins, and picked out five of his best victories. Take a look here.
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Post update
Is this going to go to the wire? It certainly looks it but Nico Rosberg could also be crowned world champion a week today.
He leads Lewis Hamilton by 26 points so if he wins in Mexico and Lewis Hamilton retires, then the title is Rosberg's.
Getty ImagesCopyright: Getty Images
Get Involved #bbcf1
Jeremiah Kariuki: Wrong strategy, wrong focus! Ferrari should be going for wins and podiums at worst! Not fastest lap!
Chris Daniels: The podium is always much more entertaining when Daniel Ricciardo is up there.
'Frustrating'
Third-placed Daniel Ricciardo, after forcing Hollywood superstar Gerard Butler to bolt down some Red Bull out of his shoe (which he has worn throughout the two-hour race) says: "The race was not that exciting.
"The start nearly went to plan, it was OK, the plan was to get both Mercedes, we got Nico which was a positive.
"We were holding second, then it was the virtual safety car and Nico managed to jump me during that period which is frustrating."
Getty ImagesCopyright: Getty Images
'I was going flat out'
Nico Rosberg, who finished second: "I lost out a bit at the start but gave everything to come back. I was going for it flat out until the end."
ReutersCopyright: Reuters
'The battle will continue'
Race winner Lewis Hamilton says: "What an incredible crowd. I feel OK, this has always been a good hunting ground for me, it always feels like home.
"The team did a great job to put us both up there and I am very proud to be up here. Finally my 50th win.
"All I can do is my best, Nico has been driving fantastically well, so the battle will continue, I will be going for it."
Rex FeaturesCopyright: Rex Features
Post update
No shoey for Daniel Ricciardo. It seems that is only for winning races, but Gerard Butler isn't getting away with it. Ricciardo slips off his shoe and pours a certain energy drink into it and hands it to Butler, who doesn't look exactly over the moon but he's a good sport and takes a big gulp of it.
Post update
Gerard Butler has been reading his stats pack.
"It's your 50th! 50th! win," he says to Lewis Hamilton. "Yeah finally," is the Briton's response.
Getty ImagesCopyright: Getty Images
Post update
"HELLO AUSTIN!" booms a voice. It's actor Gerard Butler doing the podium interviews.
Live Reporting
Gary Rose
All times stated are UK
Get involved
Getty ImagesCopyright: Getty Images 
Max VerstappenCopyright: Max Verstappen 
Video caption: Lewis Hamilton wins in Austin to close the gap in the drivers' championship.Lewis Hamilton wins in Austin to close the gap in the drivers' championship. 
Getty ImagesCopyright: Getty Images 
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F1.comCopyright: F1.com 
Getty ImagesCopyright: Getty Images 
BBCCopyright: BBC 
.Copyright: . 
Getty ImagesCopyright: Getty Images 
Getty ImagesCopyright: Getty Images 
ReutersCopyright: Reuters 
Rex FeaturesCopyright: Rex Features 
Getty ImagesCopyright: Getty Images
Latest PostThis way to Mexico
It's victory for Lewis Hamilton in the first of four mini battles. It's Mexico next, where Nico Rosberg won last year. A repeat of that and a disastrous weekend for Hamilton and Rosberg could well be celebrating his first world title.
That's it from us, I'll leave you with Andrew Benson's take on the United States Grand Prix. Mexican GP first practice gets under way on Friday, see you then.
'Very disappointed'
'First half fun, second half boring'
McLaren's Jenson Button climbed his way into the points and told Sky Sports: "It was a fun race, 19th to ninth is not too bad. The first half of the race was fun, the second was a bit boring."
Hamilton's memorable moment
BBC Radio 5 live
Listen again to the moment Lewis Hamilton won a grand prix for the 50th time.
Video content
Post update
Lewis Hamilton's victory is his fourth in five races at the Circuit of the Americas but his fifth overall at the United States Grand Prix, moving him level with Michael Schumacher on the all-time list.
Not much in it
Incredible scenes here in what is the closest vote result I have ever seen on a page I've worked on. We kicked off our coverage with the question: Should F1 bosses have outlawed moving under braking? 51% of you said no it shouldn't.
Hamilton 'down on power'
That win looked comfortable for Lewis Hamilton, but he suggests it was anything but.
The Briton has just told Sky Sports that he was down on power on Nico Rosberg.
"It would have cost me about two seconds," he says.
"It has been a long time coming and it feels even more special. It has been long, hard slog so it feels great."
'My fault, not very clever'
Red Bull's Max Verstappen surprised his team by coming in for an unwanted pit stop before a gear box failure ended his race prematurely.
He tells Sky Sports: "As a racer you always want to go forward. They said save your tyres and I was like 'I want to go forward'. The pace was good and I could easily follow the guys in front.
"I backed off a bit to save my tyres. They told me to push and I thought it was an indication to box and then realised they didn't box me. It was my fault, not very clever. In the end it did not matter."
On where he stopped, which caused the virtual safety car to come out, a situation that inadvertently cost team-mate Daniel Riccardo second place, Verstappen adds: "The team told me to keep on going, I said there was a serious issue, then they said stop there."
Timo's loving Ricciardo's antics
'P4 was the maximum we could do'
Quotes from the Ferrari duo, with Sebastian Vettel coming fourth and Kimi Raikkonen failing to finish.
Vettel tells Sky Sports: "The car was better today than yesterday and we were a match for Red Bull for the majority of the race. It was a decent day, just a shame we could not get both cars to the finish. P4 was the maximum we could get today."
Raikkonen adds: "We had some issue with the pit stop and the tyre was not tight 100%. The car was behaving pretty good but that does not matter as we didn't finish the race and it was one of those weekends.
"The wheel was attached somehow, but there was something going on and I slowed down as I saw some sparks. I don't know why it was not done 100%."
Drivers' standings
Championship leader Nico Rosberg has 331 points, 26 more than Lewis Hamilton. Meanwhile, Fernando Alonso is up into the top 10 after his impressive fifth-place finish.
Hamilton's half century
Lewis Hamilton's 50th race win came in his 185th grand prix.
We've taken a look at the key stats behind Hamilton's race wins, and picked out five of his best victories. Take a look here.
Post update
Is this going to go to the wire? It certainly looks it but Nico Rosberg could also be crowned world champion a week today.
He leads Lewis Hamilton by 26 points so if he wins in Mexico and Lewis Hamilton retires, then the title is Rosberg's.
Get Involved #bbcf1
Jeremiah Kariuki: Wrong strategy, wrong focus! Ferrari should be going for wins and podiums at worst! Not fastest lap!
Chris Daniels: The podium is always much more entertaining when Daniel Ricciardo is up there.
'Frustrating'
Third-placed Daniel Ricciardo, after forcing Hollywood superstar Gerard Butler to bolt down some Red Bull out of his shoe (which he has worn throughout the two-hour race) says: "The race was not that exciting.
"The start nearly went to plan, it was OK, the plan was to get both Mercedes, we got Nico which was a positive.
"We were holding second, then it was the virtual safety car and Nico managed to jump me during that period which is frustrating."
'I was going flat out'
Nico Rosberg, who finished second: "I lost out a bit at the start but gave everything to come back. I was going for it flat out until the end."
'The battle will continue'
Race winner Lewis Hamilton says: "What an incredible crowd. I feel OK, this has always been a good hunting ground for me, it always feels like home.
"The team did a great job to put us both up there and I am very proud to be up here. Finally my 50th win.
"All I can do is my best, Nico has been driving fantastically well, so the battle will continue, I will be going for it."
Post update
No shoey for Daniel Ricciardo. It seems that is only for winning races, but Gerard Butler isn't getting away with it. Ricciardo slips off his shoe and pours a certain energy drink into it and hands it to Butler, who doesn't look exactly over the moon but he's a good sport and takes a big gulp of it.
Post update
Gerard Butler has been reading his stats pack.
"It's your 50th! 50th! win," he says to Lewis Hamilton. "Yeah finally," is the Briton's response.
Post update
"HELLO AUSTIN!" booms a voice. It's actor Gerard Butler doing the podium interviews.