Thursday pace setter Fernando Alonso says that achieving a good result in qualifying will be crucial for Ferrari's hope of success at this weekend's Monaco Grand Prix.
Alonso set the quickest time during the rain-affected second session in Monte Carlo, having been fourth fastest in the morning.
"Despite the rain reducing the amount of track time in the second session, we more or less managed to complete all our programme and, with
or without a turbo, the complexity of this track remains the same, so doing well in qualifying will be crucial," he said.
"The increase in grip we found over the few laps we did with the Supersoft tyres leaves us in no doubt that this will be the tyre to use on Saturday afternoon, while for the race there is still a lot to learn as no one has done a long run. So we might have to improvise when it comes to strategy."
Ferrari team-mate Kimi Raikkonen encountered a more problematic time as a gearbox issue halted his progress after four laps in the second session.
"In the morning, on the dry track, we tried various set-up options, without encountering any particular problems, apart from a lack of grip at the front under braking," said the Finn.
"In the afternoon, we made a few changes to improve the balance of the car, but having waited almost an hour before being able to go out on track, a problem with the gearbox prevented me from completing the session."