Lewis Hamilton ensured that Mercedes departed Bahrain comfortably on top after setting the fastest time on the second and final day of testing.
Hamilton, who won the race in Bahrain last weekend, set a time of 1:34.136 in the morning session to spend much of the day with a healthy gap to his rivals.
Toro Rosso's Jean-Eric Vergne set the second quickest time late on, while Kevin Magnussen was third for McLaren despite a mechanical failure resulting in an off for the Danish driver.
Sergio Perez was fourth for Force India, while Red Bull's Daniel Ricciardo was fifth despite spending the morning session in the garage.
Jules Bianchi was sixth for Marussia, ahead of Sauber's Giedo van der Garde. The Dutchman lost a couple of hours of running due to a power unit problem in his C33.
Fernando Alonso tested Kimi Raikkonen's chassis - which was used during last weekend's race - and the Spaniard was eighth quickest when the team discovered damage and ended their day prematurely, having completed just 12 laps.
Marcus Ericsson suffered an ERS issue and was ninth, ahead of Williams's Felipe Nasr, who was nominated to test Pirelli's tyres.
Romain Grosjean rounded out the runners on another difficult day for Lotus. He managed 16 laps due to engine problems.