1. Max Verstappen (Red Bull) - 1:28.255

2. Charles Leclerc (Ferrari)

3. Lando Norris (McLaren)

4. Carlos Sainz (Ferrari)

5. Fernando Alonso (Aston Martin)

Headrest sorted with a quick fix. Max Verstappen comes back out and instantly goes to the top of the timesheets with a 1:28.255 on the softs.

And now Fernando Alonso has to shift out of his position. Carlos Sainz places his Ferrari into the 1:28s, just 0.091secs behind his old McLaren team-mate Lando Norris.

Second spot on the board for the Spanish Ferrari driver.

Ah well. It was nice to see a McLaren one-two while it lasted.

The old guard have started to make moves on the soft compounds, and the grandad of the grid, Fernando Alonso, bumps rookie Oscar Piastri into third place.

Red Bull have called in Max Verstappen to try and rectify the Dutchman's headrest issues.

Verstappen absence means he is dropping down the order as soft runners bank faster lap times.

Lando Norris is joined at the top of the timesheets by none other than his McLaren team-mate Oscar Piastri. Australian Piastri is half a second off the pace of the more experienced Norris.

Jolyon Palmer
Former Renault driver on BBC Radio 5 Live

That's a bit tasty from Norris...

The soft tyres are giving a lot of lap time at the moment.

Bursts of red are starting to appear out on the Miami track now as medium or hards make way for some soft rubber.

First driver to move us into the 1:28s is the McLaren of Lando Norris, who jumps above the likes of Max Verstappen and Charles Leclerc to go quickest.

1. Max Verstappen (Red Bull) - 1:29.380

2. Charles Leclerc (Ferrari) +0.117

3. Sergio Perez (Red Bull) +0.242

4. Carlos Sainz (Ferrari) +0.256

5. George Russell (Mercedes) +0.688

Lewis Hamilton takes flight as his W14 Mercedes gobbles up a decent chuck of kerb. The seven-time world champion is in seventh place, with a time in the 1:30s, with eight laps on the board.

The headrest niggles aren't enough to stop reigning world champion Max Verstappen in that speedy Red Bull, as the Dutchman is able to beat Charles Leclerc's best time to lead the pack with a 1:29.380.

Meanwhile, the Ferrari of Charles Leclerc goes quickest of the lot with a time of 1:29.497.

Max Verstappen, who is a tenth shy of Leclerc's top marker, is complaining on the Red Bull team radio that he is experiencing headrest problems again.

Jolyon Palmer
Former Renault driver on BBC Radio 5 Live

Lucky boy. Jeepers. Magnussen spun backwards and it looked like he was going to plunge into the wall but he just ended slithering down it, brushing it and went down towards the exit of Turn 15 in the end.

Kevin Magnussen is a lucky driver. The Dane takes a huge slide across the track in the middle sector but just manages to avoid smashing into the wall following a spin. Phew.

Nico Hulkenberg has emerged from the Haas garage. Great work from the mechanics to get the German driver back up and running. The Hulk is out on mediums, his team-mate Kevin Magnussen is running the white hards.

The two Alfa Romeos of Valtteri Bottas and Zhou Guanyu are eager to get laps on the board early. It's Bottas that lays down the first time of the session with a 1:32.355 but the times soon come down into the 1:31s and then 1:30s courtesy of Sergio Perez and Max Verstappen in the Red Bulls.

The more playful nature of the racing in Miami lends itself well to a quirky helmet design and Alex Albon and Lando Norris have come up with two great ones.

McLaren's Norris has gone full South Beach in order to top his basketball race helmet from last year's inaugural event, opting for a beach ball motif complete with rippling to give it a pumped up effect and warning message not to stand on it.

Image source, Lando Norris Twitter

Over in the Williams corner, Albon has also chosen a ball design, but his race lid instead nods to his love of golf. "Florida edition outta this world," the 27-year-old tweeted.

Image source, Alex Albon Twitter

Second down and 10.

*I just googled some American football terms.*

Formula 1 is back at the Hard Rock Stadium - home of the NFL's Miami Dolphins and host of six Super Bowls and countless other major sporting and musical events.

The 5.41km layout features 19 corners, three straights and three DRS zones and part of the design has taken inspiration from Mexico City's famous Foro Sol section, with fans packed in the grandstand on one side and a beach club party on the other, around Turn 12 of the circuit.

Image source, FIA Twitter

BBC Sport's Ritchie Blackman looks at whether Sergio Perez can rival Red Bull team-mate Max Verstappen in the drivers' championship.

Image source, Getty Images

Sergio Perez knows what he has to do to overcome Max Verstappen in the drivers' championship this year to claim his maiden world title in Formula 1.

"The only chance I have to beat Max is by being perfect and being able to deliver when it matters," said the Red Bull driver.

Perez and Dutchman Verstappen are free to fight it out, respectfully, on track and with the margin between the two team-mates only six points heading into the first of three races in the United States, the Mexican is happy he will be able to challenge Verstappen's dominance.

"I'm mentally very strong and that's my biggest strength and has always been," he said.

"It is not easy being Max's team-mate because he is delivering all the time and he is winning all the time and we have seen it in the past. It is not easy for a team-mate to survive.

"I believe in myself but I had to go very deep into understanding of the car and making sure I put the right tools in place to be able to fight."