Red Bull's Daniel Ricciardo quickest in second practice
Lewis Hamilton second, Max Verstappen third & Sebastian Vettel fourth
Valtteri Bottas fastest in first practice at Mexico City track
Hamilton could secure title on Sunday - needs to finish fifth
Saturday: Third practice 15:55-17:05; Qualifying 18:55-20:05
We said Stoffel Vandoorne is getting a 35-place grid penalty this weekend.
This incredible graphic shows just what McLaren have had to change on his car this season.
The blue zone is the part which is permitted, without penalties. A tough campaign for him and the team.
Image source, F1Who is your favourite Formula 1 driver?
Nurdrasch: Jackie Stewart - supreme on the track, and had more influence on motor-racing (track/driver safety) than any other driver
Arvind Mohanraj: Mika Hakkinen for pulling off what I consider to be the greatest overtaking maneuver in f1 on schumi...followed closely by Alonso.
Christian Ryan: Gilles Villeneuve. He's the most important F1 figure in Canada and one of our most important sporting figures, period.
Image source, Getty ImagesThree different drivers fastest in each of the three different sectors.
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"His engine made a strange sound" a minute again, and now Brendon Hartley spins around.
We have just over 20 minutes left. Any late drama for us?
"Engine made a strange sound at the apex of turn five," says Brendon Hartley to his Toro Rosso team.
We had Red Bull's Max Verstappen complaining of a 'weird' engine earlier on.
We haven't mentioned Lance Stroll for a while and he runs a bit wild, a bit wide. With 27 minutes left, he is 14th, two places behind Williams team-mate Felipe Massa.
Image source, EPAIt looks like some engine issues mean that is the end of Pierre Gasly's afternoon. Not been the best of days for Toro Rosso, although Brendon Hartley, in only his second weekend of racing with the team, is a creditable 13th.
Image source, Getty ImagesWho is your favourite Formula 1 driver of all time and why?
Joseph A. Simmons: Lewis Hamilton his ability to elevate his performance in qualifying and accept the challenge of bringing drama in a race. Plus his charisma to bring a new a rainbow of people to F1.
Robert Boyd: First is Coultard but Button is a close second with Hamilton third all day long.
South AfriKOPITE: Alain Prost. Hands down. Generation before Ferrari screwed F1 up by telling Ruebens to allow Schumie through. Not watched since. Its a race.
Image source, Getty ImagesThese are the standings so far. Romain Grosjean will not be seen again today after his puncture.
Pierre Gasly, back in for Toro Rosso for the dropped Daniil Kvyat, is 19th fastest or second slowest, however you want it.
Kvyat looks to be heading out of Formula 1 now, despite picking up a point last week in Austin, but Toro Rosso will want more from his replacement.
Image source, F1"The engine is doing weird things," says a worried Max Verstappen. He is third quickest so fast, even with a weird engine.
Image source, Getty ImagesFour tenths of a second are covering the top six drivers. Of which, Sebastian Vettel has just jumped into third. Ricciardo leads, Hamilton second. Could be a fascinating qualifying session tomorrow.
Image source, EPA
Andrew Benson
BBC Sport’s chief F1 writer
It's only Friday but it bodes well and again it's not a huge surprise because Red Bull and Ferrari have more down-force than Mercedes do, which is what you need on this track.
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Who is your favourite Formula 1 driver of all time and why?
Ross McIntyre: Rubens Barrichello for me on his day was quicker than Schumacher an absolute gentleman throughout his entire career and liked by all.
Alejandra: The one and only Ayrton Senna. He is the last true driver
The Duke: Mansell for me. No silver spoon. He was a true Journeyman into F1. Deserved his drive at Williams. Won through dogged determination.
Image source, Getty ImagesNow Sebastian Vettel is back on the track after his earlier excitement.
Daniel Ricciardo provided us with some fantastic racing in Austin before his engine failed on him and he had to exit the race early on.
The entertaining Australian has just moved to the top of the standings with a lap of 1:17.801. Hamilton second 0.131 behind and then the other Red Bull of Max Verstappen in third.
Image source, Getty ImagesNo more Romain Grosjean today after that spectacular tyre puncture early on in the session.
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Kevin Magnussen goes a bit wide and has to go over the kerb. He is 15th at the moment, and hopefully that has not damaged the tyres too much.
Image source, Getty ImagesHamilton now improves again. His 1:18.077 becomes 1:17.932. Still waiting to see Sebastian Vettel again on track after his 'extinguisher in the seat' moment, but it won't be long.
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Lewis Hamilton is the last to set a lap time, and instantly goes fastest thanks to a time of 1:18.077.
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