Kimi Raikkonen kept himself at the top of the timesheet on Tuesday's first day of testing in Abu Dhabi.
The Finn clocked in after 99 laps with a 1m37.768s lap time, using Pirelli's new hypersoft tyre compound, edging out Red Bull's Daniel Ricciardo.
Lewis Hamilton concluded his day of running with the third fastest time and 136 laps of mileage, some 0.782s of Raikkonen's fastest time.
Robert Kubica, F1's headline act this week, concluded his day at lunch time with 100 laps and the ninth time. The Pole was 1.2s off Lance Stroll who took over for the afternoon segment of the session.
Lap times below.
