Sebastian Vettel admitted that the failure to run on the 2014 Pirelli tyres was the biggest issue after the opening day of running ahead of the F1 season finale in Brazil.

Teams had been due to sample prototype tyres in the Friday sessions to gain some understanding over what to expect next season, but rain throughout the day meant there was no chance for the tyres to hit the track.

Speaking following the two 90 minute sessions, Vettel admitted it was a shame to have missed out on the chance to try the new tyres and also paid tribute to those fans who had braved the elements to only see limited action on track.

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"We knew it would be wet today and might be tricky," Vettel, who ended the day with the third best time, said. "The main loss from the rain was that we didn't run on the 2014 tyres. Not many people went out this afternoon in order to save tyres for the weekend - it's a bit of a shame for those in the grandstands, but unfortunately it's like this.

"Come Saturday and Sunday, we may need to have the tyres available. It was good to get a bit of a base line in these conditions; we need to be sharp for the next two days and make the right calls."

Team-mate Mark Webber meanwhile was sixth quickest and admitted it had been a challenging day as teams tried to gain as much information as possible while also saving tyres for the remainder of the weekend.

"We were working on understanding the tyres in both conditions today, we had the full wet and intermediate tyres on the car and we did quite a few laps considering most people only used one set of intermediate tyres," he said. "It was a productive day in preparation for tomorrow, as we expect some more wet conditions. We have to understand the inters on both long and short runs and also try to save tyres, so it was a testing day for the teams, but overall we got what we could out of the day."