The two Ferrari drivers headed the times in the first practice session for the Bahrain Grand Prix.
Fernando Alonso was the first of the pair to set a time but Felipe Massa produced a quicker lap with his second effort. The two F138s were separated by less than a tenth of a second.
Behind them came Nico Rosberg, who overcame an earlier problem with his downshift to set the third fastest time. Sebastian Vettel was fourth-fastest for Red Bull.
The Force India pair appeared to have good pace with Paul di Resta fifth and Adrian Sutil two-tenths off him time in eighth.
Jenson Button was just over half a second off the pace in his McLaren with Mark Webber behind him.
The two Lotus drivers completed the top ten, but Romain Grosjean had a KERS problem during the session and complained of a lack of grip “everywhere” shortly before the chequered flag came out.
Heikki Kovalainen was just over half a second slower than Charles Pic on his return to the Caterham cockpit, and gave the team some information on how their current car compared to the old ole.
Rodolfo Gonzalez made his first appearance in a timed practice session but only managed seven laps before suffering a gearbox problem.
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Image © Ferrari/Ercole Colombo