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15 laps for Max Verstappen, on the other end, Carlos Sainz has banked one.
Lando Norris is the only driver yet to clock in a lap.
Summary
Red flag lifted after power cut but cars still waiting to get back on track
Mercedes' Andrea Kimi Antonelli quickest in morning session
First look at Lewis Hamilton for Ferrari
Hamilton's team-mate Charles Leclerc quickest so far in afternoon session
Day one of three-day pre-season test in Bahrain
Season-opening Australian Grand Prix 14-16 March
Max Verstappen aiming for fifth consecutive drivers' title in 2025
McLaren begin defence of constructors' championship
Get involved: #BBCF1
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The McLaren engineers are still working on the car as Lando Norris watches on. He's got his helmet on and no doubt wants to be out on the track.
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Here's George Russell. He's swapped out the silver coat for his racing overalls.
He's on a flying lap, as Alpine's Pierre Gasly lets him through.
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Alpine's Pierre Gasly has set the fastest time in the afternoon session, 1:31.443.
Max Verstappen is just 0.001 behind the Frenchman.
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Esteban Ocon has made his way out on to the track.
Rookie Isack Hadjar has a bit of a spin, but nothing too major.
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Charles Leclerc has made a quick trip into the pits. Max Verstappen is the only driver out on track at the moment. He's banked six laps so far.
Alpine hoping to make a good startpublished at 12:38 Greenwich Mean Time
Image source, Getty ImagesOliver Oakes gets to experience his first full season in Formula 1 as a team principal, after the 37-year-old replaced Bruno Famin at Alpine during the summer of the 2024 campaign.
The French team beat Haas and RB (now Racing Bulls) to sixth place in the constructors' championship last year and he told Sky Sports: "From the moment I arrived in the team, there was a real strong spirit anyway; we were trying to turn things around - I dare say that made me look good the second half of the year.
"It was clear to see how motivated everybody was after a tough start at the beginning of the year - and not just bring an upgrade and turn things around, but to dig deep and really work as a team, which was really great to see.
"Our main focus this year is starting off well at the beginning of the season. There was the little bit of disappointment last year that took a lot of energy from the team and we had to really work hard to catch up.
"I think what we're hoping for this year is that we can keep out heads down and start off on the right footing."
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Charles Leclerc has a set of web-like aero rakes attached to the back of his Ferrari, this will help the team learn about air flow around the car.
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No signs of George Russell yet on track.
Remember the silver jacket I mentioned? Here it is.
Image source, Getty ImagesPostpublished at 12:30 Greenwich Mean Time
On his first lap, Max Verstappen has set a time of 1:33.344, in his Red Bull.
Other drivers have started to make their way onto the track, including Ferrari's Charles Leclerc.
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Isack Hadjar has set a time of 1:36.884 in the Racing Bulls.
Four-time world champion Max Verstappen is out on the track too.
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The first car is out on track.
It's rookie Isack Hadjar in the Racing Bulls.
He's taken over from Yuki Tsunoda, who managed to complete 78 laps.
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Max Verstappen and Racing Bulls rookie Isack Hadjar are in their cars.
The Mercedes engineers have formed a wall so we can't get a sneak peak of the car.
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Charles Leclerc is getting his helmet on, I am sure we will see that Ferrari soon.
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Still no action on the track yet. The engineers are busy adding the last touches before the drivers get to put in some laps.
I'm still thinking about George Russell's jacket, at least it's keeping him warm.
Signs of performancepublished at 12:10 Greenwich Mean Time
Chris Medland
F1 journalist in Bahrain
Image source, Getty ImagesJust before lunchtime, there were some interesting signs of relative performance at the tricky Turn 11. There was a fluctuating tail wind into that relatively high-speed, uphill left-hand corner at the end of the back straight, and the level of confidence of the drivers was clear from how early they picked up the throttle.
The rear end of Lewis Hamilton's Ferrari appeared not to want to grip on a few occasions, as he was sliding through the second half of the corner, whereas Oscar Piastri looked like he could be aggressive on turn-in and the McLaren stayed compliant throughout.
The same could be said for Andrea Kimi Antonelli, who was able to carry plenty of speed on entry and ended the morning on top of the time sheets, while Alex Albon asked a little bit too much of his WIlliams on one lap and ran too wide on to the exit kerb.
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George Russell is not in his car, he's waving at the camera, wearing a very shiny silver jacket.
Day one afternoon schedulepublished at 12:05 Greenwich Mean Time
Lando Norris - McLaren
Charles Leclerc - Ferrari
George Russell - Mercedes
Max Verstappen - Red Bull
Isack Hadjar - Racing Bulls
Pierre Gasly - Alpine
Carlos Sainz - Williams
Lance Stroll - Aston Martin
Esteban Ocon - Haas
Gabriel Bortoleto - Sauber
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The clock has began to tick down, but no one's in a rush to leave the garages.
Here's who will be driving in the afternoon session.
Welcome back!published at 12:00 Greenwich Mean Time
Hello again.
It's time for the afternoon session on day one of testing.
Image source, Getty Images