Felipe Massa is confident that his fastest time on the first day of the final F1 pre-season test in Spain is an indication that Williams Martini Racing will be competitive when the season begins in Australia.

Massa improved the benchmark at the Circuit de Catalunya test by completing a 1min 23.500secs lap on the soft tyres during the afternoon session, putting him more than half a second clear of Romain Grosjean's best lap from the end of the first test around the Spanish venue.

Indeed, the Brazilian is not only impressed with the burst of single lap pace from the FW37, but also its reliability, adding that he feels Williams has a car that will be towards the front of the grid when the season begins in Melbourne in two weeks' time.

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"It was very good," he said. "We did a lot of laps. We haven't had a problem since Jerez in terms of reliability so it was another day where we did everything we were supposed to do in terms of mileage. We tried to push a bit more on the performance and the result was positive.

"It is still difficult to be sure where we are, especially compared to Mercedes - I still believe Mercedes has the best car -, but I think we are there. The car is showing good performance and good handling, and we are getting a good understanding on how the set-up is working. I think we improved a lot on the car and the job we are doing. It was a day where we changed many things with the set-up and it worked."

Massa went on to say he completed a 1min 24.6secs lap on the medium rubber, three tenths slower than Nico Rosberg managed in the Mercedes earlier in the week.

"I think it was a good lap," Massa continued. "On the medium it maybe could have been quicker because I had the traffic on my best lap, maybe I lost a tenth or so. I could have done a 1min 24.5secs"