The final F1 weekend on the year is underway at Brazil, with the drivers having to bring out their swimming goggles for both sessions. Rain stopped the teams from running the Pirelli 2014 development tyres, with only the Intermediate and Wet tyres being run by the teams today. Nico Rosberg, Lewis Hamilton and Sebastien Vettel were the top three in both practice sessions today, even though the Red Bull only went out with the 15 minutes to go in the session. Vettel did get some running on the development tyre in Practice 1, but it was only a lap and a half before the team called him in, with his race engineer Guillaume Rocquelin telling him that they "have all of the data we need." After a lap and a half in damp conditions on dry tyres, decide for yourselves whether or not that information will be crucial for next year. As for any dry running, we expect the teams to get some in tomorrow at least in Practice 3 or Qualifying. The race could also be dry, but there is a 65 per-cent chance of rain affecting running, as is the case tomorrow. Chances are we might see dry Practice 3 running, then maybe a rain interrupted Qualifying thats something along the lines of 2010, where dry tyres will be used to set lap times towards the end. Pirelli's Paul Hembery however, thinks the conditions we saw today will be representative for the rest of the weekend, so the running was relevant for the teams. "The conditions we saw are likely to continue for the rest of the weekend, so it was useful for the teams to establish a wet set-up and assess the performance of the wet and intermediate tyres with different fuel loads." "It was a pity that the drivers didn’t get the chance to try the development tyres as this was an important opportunity," he continued. "On the other hand, the 2014 tyres are obviously designed for a completely different type of car to what we see competing for the final time this weekend, so there was only a limited amount to learn anyway. In the end the situation was just a bit unlucky, as on the two previous occasions that we brought development tyres to Brazil in 2011 and 2012, conditions remained dry on a Friday. As for which tyre is the strongest, "The intermediate tyre has shown itself to be very adaptable yet durable over a wide range of conditions," says Hembery. "It’s hard to predict a strategy under these circumstances, as in the end it’s the most quick-thinking and flexible tactics that tend to win in the rain – and of course there’s always an element of luck as well.” One of the teams that will be praying for a crazy wet race on Sunday will be Caterham, who are looking at finishing ahead of Marussia again in the championship. At the moment they are last because Marussia managed to finish in 13th place, so it will be both Pic and Van Der Garde's job to try and match or better that this weekend. Mercedes meanwhile, believe their best chance of winning will also be if there is a wet race, since their car seems to suit those conditions better, as evidenced earlier this year in Australia. McLaren also think wet conditions are their best bet for a good race, with Sauber looking more at a dry race for balance purposes.