Kimi Raikkonen kept Ferrari at the top of the timesheet mid-day, on the final session of pre-season testing in Barcelona.
The Scuderia driver came within a shade of team-mate Sebastian Vettel's unofficial lap record, clocking in with a 1m18.221s lap, just 0.039s off yesterday's fastest time.
Clear weather on the horizon offered teams good conditions from the outset, but it anything but a clear start for McLaren.
The Woking-based outfit's reliability issues set in once again with Fernando Alonso stopping on the track at Turn 7 with an apparent engine issue after 5 laps and just after posting the fastest first sector of the morning.
The papaya MCL33 was hauled back to the pits where a broken turbo on the Renault engine was diagnosed, an issue which will likely keep the Spaniard confined to the garage until the latter part of the afternoon.
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