Felipe Massa says signing with Mercedes for 2014 is "the best thing that Williams did".

Mercedes-powered teams have looked strong throughout F1 pre-season testing so far, with Mercedes, Williams, McLaren and Force India all looking competitive during race simulations. When asked by Crash.net if he expected Williams to be fighting with other Mercedes teams at the front in Melbourne at the start of the season, Massa said the team is definitely with the best power unit supplier.

"I think the best thing that Williams did at the moment is to sign for Mercedes," Massa said. "Honestly I'm so happy with the way they are working, I'm so happy with how professional they are and how understanding they are about things. I'm really happy with Mercedes and the work we are doing together.

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"What you have to understand is that they are not just controlling the engine. They understand a lot about the car as well; a lot about the set-up and about many things that also helps us to understand things more quickly. So I think it was a very good change."

With Jenson Button praising Williams but worrying whether it can match the development pace of the likes of Red Bull and Mercedes, Massa insists the team has the potential to do so.

"I'm confident. I think we have good people, we have people arriving - even one of them I know very well! [former race engineer Rob Smedley] - so we have so many good people arriving. There are new people working here too so I really believe in this team. I believe they have the potential to be competitive. I believe they also have a good understanding to develop a car.

"It's also too early to say; I haven't worked at Williams for a long time, from the first race to the last race, but I think things have started well. When the correlation between the wind tunnel and the track works then I think it's a very good thing. Everything we've brought to the track up until now has worked."