Lewis Hamilton, Carlos Sainz and Esteban Ocon are the three drivers out on track at the moment.

Hamilton has set the fastest time overall in sector one but runs wide.

Yuki Tsunoda is back in the garage, the Racing Bulls engineers are working away at his car.

Williams' Carlos Sainz is speeding down the track. He's in the seat for a full day of testing.

An hour left of this morning's testing session.

Lewis Hamilton is the fastest in the Ferrari, with a time of 1:29.670

George Russell's Mercedes has completed 50 laps now, the most so far.

Image source, Getty Images

Former F1 driver Mark Webber, who now manages Oscar Piastri, has been watching on from the McLaren garage.

Piastri has pipped Liam Lawson to fifth spot. He has completed 23 laps, so far.

1. Lewis Hamilton (Ferrari)

2. George Russell (Mercedes)

3. Carlos Sainz (Williams)

4. Pierre Gasly (Alpine)

5. Liam Lawson (Red Bull)

Mercedes' George Russell was on a flying lap and topped the leaderboard, but not for too long.

Lewis Hamilton whizzed down the circuit in his Ferrari, he set the fastest time in sector one and three and returns to the top spot.

Carlos Sainz is now out on track. He's on a fast lap and has gone purple on sector one.

But he's not quite fast enough to top the leaderboard.

Esteban Ocon, Yuki Tsunoda and Liam Lawson are the drivers on track.

Ocon has completed 35 laps. Tsunoda 27 and Lawson is on 28.

Oscar Piastri, who had the fewest laps, has now completed 20 laps. He's back into the garage.

His engineers seem to be crowded around the front of his car.

Lewis Hamilton locks up into turn one but is back on his way around the track.

Carlos Sainz is on the hard tyres and is running laps around the circuit.

Fernando Alonso nearly runs into a bit of traffic but he passes by with ease.

The weather is not clearing up but all 10 drivers are out on the track.

"It's starting to rain more now"

McLaren have now joined the pack.

Oh dear, Oscar Piastri runs wide after hitting a damp spot on the track.

He has set a lap time now, though. It's a 1:32.719 for the Australian driver.

Tsunoda's car has been painted with some flow-vis paint.

The way the paint flows, while he is out on track, will give his engineers important information on air flow around the car.

Racing Bulls' Yuki Tsunoda is the next driver to make his way around the track.

George Russell has banked 35 laps so far.

George Russell seems to be managing just fine on the track.

Nico Hulkenberg is the next driver out to join him, in his green Sauber.

We have action. George Russell has jumped back in his Mercedes and is back out on the track.

Image source, Getty Images

It's not long now until lights out.

The first race of the 2025 Formula 1 season is the Australian Grand Prix at Albert Park in Melbourne, which takes place 14-16 March.

With an 11-hour time difference between the UK and Melbourne, the race starts at 04:00 GMT.

Friday, 14 March (all times GMT)

First practice - 01:30-02:30

Second practice - 05:00-06:00

Saturday, 15 March

Third practice - 01:30-02:30

Qualifying - 05:00-06:00

Sunday, 16 March

Race - 04:00

1. Lewis Hamilton (Ferrari) - 1:30.080

2. Carlos Sainz (Williams) +0.072

3. George Russell (Mercedes) +0.299

4. Pierre Gasly (Alpine) +0.766

5. Liam Lawson (Red Bull) +1.153

6. Nico Hulkenberg (Sauber) +1.445

7. Fernando Alonso (Aston Martin) +2.862

8. Esteban Ocon (Haas) +3.961

9. Yuki Tsunoda (Racing Bulls) +7.881

10. Oscar Piastri (McLaren) no time set