Sebastian Vettel: "It was a productive day of running: we covered a good number of laps and found a decent balance with the car. That is positive because it can be tricky to find the flow in Sochi, so I think we have a good starting point. But it looks like it will rain tomorrow. That could make for an interesting qualifying session and, because it will mix up the field, it could lead to some opportunities for us, especially with some other drivers taking grid penalties already this weekend. Sunday is looking drier, so today's positive work is still important. We will make sure we are well prepared tonight and then see what tomorrow brings."

Lance Stroll: "It is good to be back on track. We have learned quite a bit today and I think there is more to come from me and the car. The forecast is suggesting that rain is going to be a factor tomorrow, which could change the course of the weekend. Obviously, it is a very different experience to drive in the wet and we have never experienced those sorts of conditions in Sochi before. That would be an exciting challenge and we will be prepared for the possibility tomorrow. We will go away and review what we have learned today and then see what the weather has in store for FP3 and qualifying."

Check out our Friday gallery from Sochi, here.