Postpublished at 10:09 Greenwich Mean Time
Under an hour left of morning testing.
Eight drivers will be passing on the duties to their teammates.
Alex Albon and Max Verstappen will be running testing for the full day.
Three days of pre-season testing complete in Bahrain
Williams' Carlos Sainz sets quickest time overall with a 1:29.366
George Russell in the Mercedes fastest on final day
Lando Norris and McLaren top times on day one
Season-opening Australian Grand Prix takes place 14-16 March
Sunday's race starts at 04:00 GMT
Get involved: #BBCF1
Tasnim Chowdhury
Under an hour left of morning testing.
Eight drivers will be passing on the duties to their teammates.
Alex Albon and Max Verstappen will be running testing for the full day.
Racing Bulls rookie Isack Hadjar has been busy putting in the laps. He's very close to completing a race length.
Max Verstappen's Red Bull has been popped up on a high stand and there are engineers around the car.
Verstappen is stood beside his car, looking ready to head out.
Chris Medland
F1 journalist in Bahrain
Ferrari chairman John Elkann made a rare appearance at testing yesterday, and was in the race control building for a spell before he walked into the Ferrari garage to chat with Lewis Hamilton. That came during a lull in running due to this morning's rain, so Hamilton was out of the car for a while. Elkann recommended a book he's reading to his new driver, with Hamilton saying their relationship is based more on "normal life stuff" than shared racing interests.
According to Italian media, Elkann has only made one other visit to pre-season testing in the past seven years, but this is a well-timed trip. The hype surrounding Hamilton has been enormous, and Ferrari are also very much targeting championships after the strong second half of 2024 they had.
The early signs for the new Hamilton-Ferrari partnership have been encouraging, with the seven-time world champion saying he is enjoying driving the car so far, as he started to push its limits a little bit more this morning. Hamilton says he's confident there is plenty more potential in the car to explore, too.
Lots of bright green flow-vis paint sprayed onto the front left of Jack Doohan's car.
The way the paint flows down the car will help the team understand airflow.
Another pitstop practice, this time for Ferrari.
Oliver Bearman and Andrea Kimi Antonelli are the only drivers out on track.
Max Verstappen (Red Bull) - 36
Alex Albon (Williams) - 38
Lando Norris (McLaren) - 41
Charles Leclerc (Ferrari) - 40
Andrea Kimi Antonelli (Mercedes) - 32
Fernando Alonso (Aston Martin) - 31
Jack Doohan (Alpine) - 44
Oliver Bearman (Haas) - 30
Isack Hadjar (Racing Bulls) - 44
Gabriel Bortoleto (Sauber) - 22
A pitstop practice for the Red Bull team before they wheel Max Verstappen back into the garage.
Isack Hadjar has popped his helmet back on and will be getting ready to head back out to the track.
Oliver Bearman is on an out lap and will be running race laps in his Haas.
Ferrari's Charles Leclerc remains the fastest driver so far,
A set of tyres and mechanics are getting ready in the Red Bull garage.
Chris Medland
F1 journalist in Bahrain
Naturally there has been a lot of focus on Lewis Hamilton’s move to Ferrari, but that change also marks a fresh start for Mercedes.
Kimi Antonelli, 18, has taken Hamilton’s seat and has been loving life as an F1 driver so far. Team members talk about how enthusiastic and energised he is at the start of his career, and it certainly comes across whenever he’s out of the car.
Antonelli has been extremely engaging and friendly within the paddock ever since he was announced as a Mercedes driver, and is also having a very solid week behind the wheel, too - he sits second on the timing screens at this point today.
Fernando Alonso has found some speed and moves past Oliver Bearman up to ninth.
Bearman, Isack Hadjar and Gabriel Bortoleto are the only three in the garages. Everyone else is running laps on the track.
Isack Hadjar has now completed the most laps, the rookie is on 42 laps.
Racing Bulls rookie Isack Hadjar is the first out on the track.
Max Verstappen quickly follows.
Wind has picked up in Bahrain, but the sky is clear.
All 10 drivers are back in the garages.
Andrea Kimi Antonelli is on a flying lap now, he has gone fastest overall in sector one. But he was not fast enough to overtake Charles Leclerc's time.
Max Verstappen is back in the garage, the Red Bull engineers quickly begin to work on his car.
He is currently fourth on the leaderboard.
Max Verstappen (Red Bull) - 23
Alex Albon (Williams) - 26
Lando Norris (McLaren) - 29
Charles Leclerc (Ferrari) - 32
Andrea Kimi Antonelli (Mercedes) - 19
Fernando Alonso (Aston Martin) - 25
Jack Doohan (Alpine) - 38
Oliver Bearman (Haas) - 21
Isack Hadjar (Racing Bulls) - 36
Gabriel Bortoleto (Sauber) - 22
Lots of laps being put in, Jack Doohan has completed the most laps, 38 for him.
He is back in the garage and out of the car.
Two hours remaining of the morning session.
Will we see race laps from the drivers?
Mercedes' Andrea Kimi Antonelli was back on the circuit after his engineers worked on his car. He's put in a few laps before heading back to the garage.
Charles Leclerc has a new set of medium tyres and heads back out onto the race track.