Sebastian Vettel says it's impossible to know what role tires will play in Monaco this weekend until the teams have done some running.
The consensus is that Mercedes will be quick in qualifying once again, but how that might pan out in the race is hard to predict.
"People make out that Mercedes is the favorite," said Vettel. "Obviously they had a very impressive speed in the last couple of races, and as we know in Monaco it's very important to qualify in the front.
"It's a bit difficult and unknown at this stage how important the tires will be, especially how long they last. If they last well, then they won't be very important. If people are running into trouble, then it could be that pole is not everything.
"But, for sure, it's not a secret: around here you need to have clear laps and no traffic because overtaking is quite difficult. I still think that everyone is shooting for pole, and as I said in the last couple of races, Mercedes was very strong. If we get into the groove n...