Valtteri Bottas set the pace in first practice for the Spanish Grand Prix but both Ferrari cars showed good speed as well.
Bottas, who leads the drivers' championship by one point from Mercedes-GP teammate Lewis Hamilton, lapped the Circuit de Catalunya in a time of 1 minute, 17.951 seconds.
His session ended early though due to an oil leak.
That was just 0.115 secs quicker then Sebastian Vettel's Ferrari, with Charles Leclerc 0.221 adrift.
It was an encouraging start for Ferrari, who have failed to live up to their pre-season promise as Mercedes have had one-two finishes at all four races so far.
Hamilton was fourth quickest, 0.6 seconds behind his teammate.
It was a worrying session for Max Verstappen as his Red Bull Racing car was kept in the garage in the closing stages as it began to visibly leak oil.
He was only 12th quickest, almost two seconds slower then Bottas.
Lance Stroll crashed in the final seconds of his session in his Racing Point.
Second practice begins at 5pm UAE time with the race on Sunday starting at 5.10pm.
