Hello and welcome to ESPN's coverage of the second practice session for the United States Grand Prix in Austin.
Hamilton topped FP1, picking up right where he left off in Sochi. Rosberg will be hoping to claw back some of the initiative this afternoon.
@WillHawkins: I liked Kayak enough I kept it in there.
The drivers are getting strapped in - we're moments away from this session going green. Worth remembering this is the session we saw the first runs on the option tyre, which will give us the first idea of how the teams will fare in qualifying.
Other than that, Will, the sun is out and the temperature has risen significantly since FP1, to nearly 20 degrees.
The clock is ticking, this session is underway.
No-one heads out on track earlier on. If only there were some smaller teams further down the grid keen to head out on track at times like this.
Bottas breaks the silence and heads out on track for Williams, the Finn back in his car after handing it over to Felipe Nasr this morning. JEV also returns after Max Verstappen's appearance this morning.
Grosjean and Button join Bottas on track.
Everyone out on the medium tyre early on. We won't see any runs on the yellow-striped soft until the track has been rubbered in later on in the session.
@Vinayak: No-one is really sure. For whatever reason, someone is delaying the decision.
Button goes P1 but Bottas then leaps above the 2009 world champion, posting a 1:44.534.
@Nigel: Pure speculation. Alonso said he wouldn't be driving a Mercedes engine next year, first of all. Secondly, we haven't reported anything because nothing official has been announced. Rumours like that belong on F1 message boards, not on F1 news websites.
@tony: Vettel did say yesterday his season looks worse on paper than it actually has been, and that he has been unfortunate not to win. I think that's a fair comment, to be honest.
Button has reclaimed P1, lowering the benchmark to 1:42.427, but complains crosswinds at the circuit are "playing a big part".
@ArisRoutis: No, but just because there are rumours around does not mean we need to report them. I meant confirmation as in - McLaren confirm he is driving there next year, or Audi confirms he is driving in Le Mans, something like that. Until then, anyone writing that they know for a fact where Alonso is going is lying to ensure readers.
Magnussen slots in behind his team-mate to go second, while JEV jumps into third after missing the morning session. Toro Rosso looking fairly handy out there today.
Everyone but Vettel, Ricciardo and Hamilton are currently in the pit lane.
Hulkenberg moves into third, 0.686s down on Button. The Lotuses are fourth and fifth in the early stages.
Bottas improves on his earlier time and moves four tenths behind Button. As we saw in Sochi, McLaren looks very impressive out there on the prime tyre.