It's quite light on upgrades across the paddock this weekend. Ferrari, like Haas, are looking to benefit from a floor update.

According to the FIA document, when it comes to the Suderia, "particular attention has been put on losses reduction in all the updated areas, with the aim to improve the overall aerodynamic performance and car efficiency."

Ferrari - floor

Alfa Romeo - beam wing

Aston Martin - cooling louvres

Alpha Tauri - front wing, sidepod inlet

Haas - floor

No word from Haas yet as to whether Nico Hulkenberg's car will be ready for the start of second practice. The American team have brought an upgraded floor to this weekend's round five race in south Florida.

Image source, Getty Images

Mercedes made a late surge in the dying moments of first practice and ended up topping the timesheets, with George Russell sitting in first spot ahead of team-mate Lewis Hamilton in second.

There was a red flag during the session when Haas' Nico Hulkenberg crashed into the wall at Turn Three. Alpha Tauri's Nyck de Vries also saw his hour ended prematurely because of an accident.

Image source, Formula 1

Here we go again. Miami is gearing up for another practice session at 22:30 BST, with temperatures slightly cooler after the highs of the opening hour.

Full commentary of this session will be available on BBC Radio 5 Sports Extra, the BBC Sounds app and at the top of this page using the audio icon from 22:25 BST.

Harry Benjamin, Jolyon Palmer, Andrew Benson and Christian Hewgill will be taking you through it.

Yuki Tsunoda hopes you enjoyed the break.

Image source, Getty Images

Andrew Benson
BBC Sport’s chief F1 writer in Miami

Image source, Getty Images

George Russell led Lewis Hamilton to a Mercedes one-two in first practice at the Miami Grand Prix with Red Bull's Max Verstappen down in fourth place.

The Mercedes drivers benefited from runs late in the session to leap ahead of Verstappen, who was also pipped by Charles Leclerc's Ferrari.

Russell beat Hamilton by 0.212 seconds and 0.424secs up on Verstappen.

Red Bull's Sergio Perez, six points behind Verstappen in the championship, was down in 11th place.

Nico Hulkenberg caused a red-flag period when he crashed at Turn Three in his Haas. Alpha Tauri's Nyck de Vries also had an accident early on that terminated his session.

Read the full report here

Image source, Getty Images

First practice in the bag in the heat of the Hard Rock Stadium in Miami.

The track was ramping up towards the end of the session, so what will the second hour of running bring us? Another Mercedes one-two?

Come back and join us at 22:00 BST.

In the meantime, have a listen to the Miami Grand Prix preview on BBC Radio 5 Live from 21:00 BST. You can find the programme here.

See you shortly.

11. Sergio Perez (Red Bull)

12. Oscar Piastri (McLaren)

13. Kevin Magnussen (Haas)

14. Valtteri Bottas (Alfa Romeo)

15. Alex Albon (Williams)

16. Lando Norris (McLaren)

17. Zhou Guanyu (Alfa Romeo)

18. Yuki Tsunoda (Alpha Tauri)

19. Logan Sargeant (Williams)

20. Nyck de Vries (Alpha Tauri)

1. George Russell (Mercedes) - 1:30.125

2. Lewis Hamilton (Mercedes)

3. Charles Leclerc (Ferrari)

4. Max Verstappen (Red Bull)

5. Carlos Sainz (Ferrari)

6. Pierre Gasly (Alpine)

7. Fernando Alonso (Aston Martin)

8. Lance Stroll (Aston Martin)

9. Nico Hulkenberg (Haas)

10. Esteban Ocon (Alpine)

Lewis Hamilton brings the other Mercedes home in second, the Ferrari of Charles Leclerc is third, world champion Max Verstappen finishes fourth and Leclerc's Scuderia team-mate Carlos Sainz completes the top five.

Yuki Tsunoda at the end of the session was absolutely furious with one of the Alpines. Nice long bleeps added to his radio message.

Jolyon Palmer
Former Renault driver on BBC Radio 5 Live

That's a remarkable turnaround for a guy who needed a steering rack change at the start of this session.

A late dart from Lewis Hamilton sees the Mercedes leapfrog up the order and go quickest on a set of softs with a 1:30.337.

But wait, is that the other Mercedes? It is. And George Russell puts in a fast lap on the red rubber and jumps two tenths above his team-mate.

The track is packed, though, and Russell has to swerve to avoid the traffic. "Oh my word. I'm trying to get out of the way of everyone," he says on the team radio.

Three minutes on the clock and after a slight bump over the kerb, Charles Leclerc is back in second place, two tenths behind Max Verstappen in first spot. on C4 soft rubber.

Nico Hulkenberg, despite that crash earlier, is still in the top five with his time of 1:31.392 on a set of softs.

Where is Pierre Gasly going? The Alpine driver decides to explore Miami off the beaten track and needs to do some fancy reversing to get his car back onto the racing line.

Charles Leclerc's Ferrari team-mate Carlos Sainz is yet to join the celebrations on the podium this campaign. The Spaniard, who is fifth in the drivers' standings, pushes Leclerc down the pecking order and slots into that second spot with a 1:30.993.

Our polesitter in both the sprint and the main race in Azerbaijan is another soft runner. Charles Leclerc is looking for back-to-back podium finishes for the first time this season and goes second quickest behind Max Verstappen with a 1:31.072.

While most drivers are testing out the C4 soft tyres, the other Haas of Kevin Magnussen resumes on the medium rubber he began the session on to finish the rest of his run plan.

Max Verstappen has got someone on his tail during this lap: it's Lewis Hamilton in his Mercedes.

While Hamilton is quietly going through his run plan, Verstappen is putting in purple sectors on a set of soft tyres. By the end of the lap, the Dutchman can improve on his previous top marker and puts down a new challenge to the rest of the field with a 1:30.549.

Green again. About 17 minutes remaining in this first practice session.