Lance Stroll: "It was great fun out there today. There were big crowds in the stands and I enjoy this track. It has been a positive start so far with competitive pace and we have learned a lot too. Managing the tyres will be crucial on Sunday because it is very easy to overheat them in these hot conditions, and we saw that today, plus it is a demanding track generally with some quick sections. We finished the day in P6 and, while I expect others to improve tomorrow, we have some good momentum that we will carry into the weekend."

Sebastian Vettel: "Today we ran a different practice programme to the majority of the field because we will be taking a grid penalty [due to changing elements of the power unit], so that means our focus is on the race, rather than qualifying. We maximised the sessions to work on longer runs and gather lots of data to review. Hopefully, that will help us on Sunday and we will be in good shape for the race. Although we will start further back, Austin is a track where you can overtake and the hotter conditions will be a tough test for all of us, which will hopefully create opportunities to move forward in the race."

Check out our Friday gallery from COTA, here.