Mercedes: Ferrari favourite to win Brazilian GP after ‘big gamble’

Ferrari changed both Sebastian Vettel and Kimi Raikkonen on to Pirelli's soft compound after just one sighting lap on supersofts at the beginning of Q2, at a point when rain was believed to be imminent.

That timing was of the essence was emphasised by Vettel later receiving punishment for his behaviour when the FIA called him in to the weighbridge at pit entry.

Vettel and Raikkonen lapped quickly enough to move through to Q3 and will therefore start the race on the theoretically more durable soft rubber.

Both the Mercedes and Red Bull drivers must start on supersofts having set their fastest Q2 times on that compound.

Lewis Hamilton will start the race from pole after going quickest in Q3 but, like Valtteri Bottas, Daniel Ricciardo and Max Verstappen, he was unable to better his Q2 lap on supersofts after switching to the softs.

Vettel and Raikkonen will start second and fourth.

"Ferrari took a big gamble in qualifying, switching tyres when the rain was imminent," said Wolff.

"And it paid off. They are on the more robust tyre for tomorrow.

"They have a disadvantage at the start but a big advantage over the first 10-15 laps, which in our models shows them as the favourite.

"We didn't take that risk because we thought it was disproportionate, but we can understand that Ferrari, where they are now, the only way of really staying in the fight for the constructors' championship is to do things differently and take risks, and that's what they did, and it paid off."

Pirelli believes that the fastest race strategy, if conditions remain as expected, involves a single stop with a 32-36-lap opening stint on softs followed by a run to to the flag on mediums.

Supersoft runners may have to stop up to seven laps earlier.

Race day is forecast to be warmer than at any other point during the race weekend, introducing another element of uncertainty into tyre management.

"We've modified things for this weekend," said Wolff. "And we've been happy so far with what we've seen, but nevertheless the tyre overheating is going to be the biggest struggle, keeping those tyres alive, not making them blister.

"With the mentioned disadvantage of the supersoft versus the soft, we are on the back foot a little bit."