Sebastian Vettel dominated Friday practice at the United States Grand Prix, going 1.4s quicker in FP1 and 0.7s quicker in FP2 than his nearest rival.
Vettel can clinch a third title this weekend, although his first target is simply to stay at the front.
"It was slippery this morning and a bit like driving on ice. It wasn’t so easy, but we managed to get into a rhythm. We had a bit of a problem this afternoon and so couldn’t run as much as we wanted, but we got two good runs which is important for tomorrow and Sunday".
"I think there were a couple of surprises today in terms of pace, so we’ll see tomorrow. The track will constantly improve – it’s good that we are amongst the guys at the top, now we’ll try to improve the car to make sure we stay there".
Mark Webber added that he enjoys the new circuit.
"It's a pretty good track, it's quick, especially the first sector which is quite full on, although sectors two and three are more traditional and similar to other tracks", he said.
"It was very slippery to start with, which was quite frustrating probably for all of us, but in the end the track rubbered in pretty well and we got into a good rhythm. As with all new circuits, you've got to work out where you can prioritise your time and where to compromise. It's got a bit of everything really, so it’s good".