Hello and welcome to ESPNF1's coverage of third and final practice for the United States Grand Prix in Austin.
The Mercedes drivers were separated by just 0.003s yesterday - which sets up a tantalising fight for the rest of the weekend.
But once again the headlines are dominated by the negatives in F1. Last night Lotus played down rumours of a boycott from the smaller teams, which was rumoured to be going ahead in protest at the direction of F1.
As always, I'm fascinated to hear your views on this whole mess.
@mfbull: I don't know - I don't think anybody has a clue what he is really thinking. His comments on this whole mess have been strange, and usually Ecclestone's comments have an agenda behind them.
@RogertheCabinboy: Nothing since Lotus' denial it was going ahead. Clearly, it's something which has been considered but the small teams risk losing their prize money if they do something. It would be an absolute disaster for F1 in America if it did go ahead, however.
@Satyaban: Well, what's the point of having teams like that in any sport if you think like that? Would you enjoy football if Real Madrid played Barcelona every weekend? Maybe some people would, but the majority would not.
The clock is ticking and this session is underway.
@mfbull: Jerry Jones at the Dallas Cowboys a good example.
We've got activity in the pit lane as the first cars make their way out of the pit lane and up the hill to Turn 1.
Vettel, who is set for a limited qualifying run, heads out on used soft tyres. Expect the world champion's benchmark times to be off the pace today, his focus is on long runs ahead of the race.
Vettel''s Red Bull is equipped with his brand new power train - the one which earnt him a pit lane start for Sunday.
Magnussen sets the first time of the session, a 1:40.261
Championship leader Hamilton heads out. Mercedes asks him for feedback on his start, and he tells them he can probably hit the clutch more aggressively after his latest simulation.
Magnussen has lowered the benchmark to 1:41.567 out in front. Everyone except Vettel on the medium tyre.
Hulkenberg's first run puts him P3, behind Magnussen and Vergne.
@AnderKaver: It was a trio of Russian sponsors, and part of the deal was Sirotkin's elevation to F1.
Button briefly jumps to P1 but is then ousted by his rookie team-mate, as Magnussen lowers the benchmark further to a 1:40.837.
@MichaelVolkmer: Nope. Haas deferred its entry to 2016, which it had the option to do.
Still yet to see Williams, Red Bull, Mercedes and Ferrari after their installation laps.
Sutil runs off the track at Turn 12 and continues.
Bottas and Massa are out on track. Will we see the traditional Saturday improvement from Williams today?