Williams Martini Racing could afford to finish the penultimate day of Formula 1 testing an hour early as Felipe Massa completed his programme and notched up more than 100 laps at the Circuit de Catalunya.

Though it hasn't had a chance to rival Mercedes yet, Massa's 1min 23.262secs lap on the super-soft rubber has earmarked Williams as potentially its closest threat in terms of raw pace.

Furthermore, the Mercedes-powered FW37 has also proven reliable in the hands of Massa and Valtteri Bottas, so much so that the Brazilian was happy to finish a bit earlier than scheduled.

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"We had another good day with over 100 laps completed. We reached the end of the programme in good time and the car has remained very reliable over all three tests. Our long runs look positive and the car remains consistent throughout the stints.

"We are not the only quick car on the track though and the fight behind Mercedes will be interesting. I now have to get ready for the first race of the season in Melbourne, which I am really looking forward