Williams driver Valtteri Bottas has clocked the fastest lap after day two of the current round of pre-season F1 testing in Barcelona.
Defending world champion Lewis Hamilton finished 0.36 seconds behind Bottas.
"Not particularly great as tyres aren't particularly good. It was just - I've been pounding around doing multiple laps on long runs which is not the most exciting and then to get to light fuel is always an exciting feeling but it's always new when you get back to pushing for a single lap so the car's just in a different ballpark and not in the right one at the moment so that's what we've got to work on to get right for tomorrow."
The final day of pre-season testing takes place on Thursday.
This year's F1 season gets underway on Sunday in Australia.
