After "a good few weeks on track", Nico Rosberg has urged Mercedes to continue pushing as there is always more performance to gain.
Having finished runner-up in Mercedes' second 1-2 result of the Championship on Sunday night, Rosberg returned to the Sakhir circuit on Tuesday for Day One of the in-season test.
The German, who worked through set-up evaluations, covered 120 laps with a best time of 1:35.897 to finish P1.
But despite yet another pace-setting lap time for a Mercedes driver, Rosberg reckons there is still more to come from his team and their W05.
He said: "Our main aim was to try different directions with set-up and to get to know the tyres a bit better.
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