Postpublished at 10:11 Greenwich Mean Time
Oliver Bearman has clocked 56 laps, just one short of a race distance.
He's back in the Haas garage and hopped out of the car to speak to his race engineer.
Summary
Lando Norris ends opening day quickest in the McLaren
George Russell for Mercedes second, Red Bull's Max Verstappen third
Lengthy delay during afternoon session due to circuit-wide power cut
First look at Lewis Hamilton for Ferrari
Day two starts at 07:00 GMT on Thursday
Season-opening Australian Grand Prix 14-16 March
Verstappen aiming for fifth consecutive drivers' title in 2025
McLaren begin defence of constructors' championship
Get involved: #BBCF1
Postpublished at 10:11 Greenwich Mean Time
Antonelli in P1published at 10:08 Greenwich Mean Time
Andrea Kimi Antonelli has jumped up to the first spot on the leaderboard.
He's on a lap time of 1:31.428 and has clocked in 53 laps.
Leaderboardpublished at 10:06 Greenwich Mean Time
1. Alex Albon (Williams) - 1:31.573
2. Liam Lawson (Red Bull) +0.001
3. Lewis Hamilton (Ferrari) +0.261
4. Jack Doohan (Alpine) +0.268
5. Fernando Alonso (Aston Martin) +0.301
6. Yuki Tsunoda (Racing Bulls) +0.336
7. Oscar Piastri (McLaren) +0.511
8. Nico Hulkenberg (Sauber) +0.596
9. Andrea Kimi Antonelli (Mercedes) +0.625
10. Oliver Bearman (Haas) +4.046
Postpublished at 10:04 Greenwich Mean Time
Liam Lawson makes a trip to the Red Bull garage, the team will want to check the car for any damage.
Under an hour left of the morning session.
Postpublished at 10:01 Greenwich Mean Time
Oh no, Liam Lawson has a moment and spins while exiting Turn Three but luckily he manages to avoid the gravel.
Postpublished at 09:57 Greenwich Mean Time
A bit of an overturn for Red Bull's Liam Lawson as he goes wide on turn four, but he's back on the track.
Just a little over an hour left of the morning session.
Postpublished at 09:52 Greenwich Mean Time
Andrea Kimi Antonelli has completed the most laps now, his tally is 49. Oliver Bearman is on 48.
Nico Hulkenberg is on 45 laps, Oscar Piastri is on 37, Liam Lawson is on 40.
Fernando Alonso has completed the fewest laps, he's on 21.
Postpublished at 09:48 Greenwich Mean Time
Oscar Piastri has joined the two rookies on the track. The bright papaya livery has brightened up the cloudy grey skies.
He does run a little wide on the straight.
Team radio - Bearman to Haaspublished at 09:43 Greenwich Mean Time
Bearman: "I feel like wind is picking up a little"
Rookies on trackpublished at 09:41 Greenwich Mean Time
Andrea Kimi Antonelli is the only driver out on track at the moment, he's just on the third sector in the Mercedes.
Fellow rookie Oliver Bearman has joined him out on track.
Postpublished at 09:38 Greenwich Mean Time
Image source, Getty ImagesIn the McLaren garage, Oscar Piastri is sat in his car, nodding along to something his engineer was saying.
The first race is his home one in Australia.
Postpublished at 09:34 Greenwich Mean Time
Liam Lawson has jumped out of his Red Bull to let his team have a look at the car.
Alex Albon is still topping the timesheet in his Williams.
How many laps have been completed?published at 09:29 Greenwich Mean Time
Yuki Tsunoda has completed the most, with 48 laps. Fernando Alonso has only completed 19 laps, so far.
Alex Albon is on 38 laps, Liam Lawson on 39, Hamilton on 41, Jack Doohan on 40, Nico Hulkenberg on 42, Andrea Kimi Antonelli on 38.
Oscar Piastri is on 22 and Oliver Bearman is on 41 laps.
Can F1 teams test during the season?published at 09:27 Greenwich Mean Time
Image source, Getty ImagesIn the past, F1 teams were permitted to test whenever and wherever they wanted, as frequently as they saw fit.
But over time, concerns about the environmental impact, the costs involved, and the growing performance disparity between teams at the front and back, led to the introduction of increasingly stringent rules on testing.
In-season testing was banned in 2009, leaving the pre-season session as a vital period to analyse and refine their cars.
Teams are allowed to test cars which are at least two years old during seasons, but this is primarily used for the development of younger or recently arrived drivers, given the limited possibility of learning anything useful about car development.
Postpublished at 09:21 Greenwich Mean Time
The engineers in the Aston Martin garage have been peering into the car. There must be something Fernando Alonso isn't happy with.
Back on track, has something flown off the Red Bull of Liam Lawson?
Postpublished at 09:14 Greenwich Mean Time
Could we see Williams back on the podium this season?
They have the experienced duo of Alex Albon and Carlos Sainz, who has joined from Ferrari.
Only time will tell.
Postpublished at 09:12 Greenwich Mean Time
This Williams has some speed to it.
Alex Albon is back at the top of the leaderboard, setting a time of 1:31.573.
Liam Lawson runs a little wide in the Red Bull, but is only 0.001 behind Albon.
Postpublished at 09:10 Greenwich Mean Time
Image source, Getty ImagesFerrari's Charles Leclerc will be at the wheel in the second session today, In the meantime, he has been doing some revision by looking at the data the team has gathered.
Postpublished at 09:07 Greenwich Mean Time
Image source, Getty ImagesRacing Bull's Yuki Tsunoda has been checking the data from the first few hours of testing.
Meanwhile, Liam Lawson continues to top the leaderboard in the Red Bull.
Postpublished at 09:02 Greenwich Mean Time
Andrea Kimi Antonelli is whizzing down the track in Bahrain. The 18-year-old has been in Mercedes' junior team since the age of 11.
He passed his driving test last month, first time.
Image source, Getty Images