Ferrari’s Charles Leclerc edged out Lando Norris in practice for the Abu Dhabi Grand Prix which was red-flagged on two occasions.
A combined 30-minute delay wiped out half of the one-hour session after Carlos Sainz and Nico Hulkenberg both crashed out.
Leclerc saw off Norris by just 0.043 seconds, with Max Verstappen third, 0.173 sec off the pace. George Russell and Lewis Hamilton finished sixth and eighth respectively for Mercedes.
A week after he smashed into a loose drain cover in Las Vegas, Sainz was in the wars again, but on this occasion it was through driver error.
Sainz – who appeared to be put off by another car arriving from the pits – lost control of his machine through turn three and ended up in the barrier.
Although the Spaniard was unharmed in the high-speed smash – with the running just eight-and-a-half minutes old – he sustained significant damage to his car; with the sidepods, floor, rear suspension and front wing of his Ferrari all destroyed.
Sainz’s impact also left the barrier in a mess and a 22-minute delay ensued as the tyre wall was repaired.
But only moments after the running re-started, the red flag was out again – this time after Nico Hulkenberg crashed on the exit of turn one.
On cold tyres, the German was too hasty on the throttle, sliding into the barrier before stopping in his wounded machine.
The stoppages arrived as a blow to half the grid who sat out the opening session as 10 rookie drivers were blooded at the Yas Marina Circuit.
Mercedes are looking to hang on to second in the constructors’ championship and are only four points ahead of Ferrari with one race to go.
And the troubled team will be alarmed by Leclerc’s speed as the Monegasque, on pole position in Las Vegas, topped the order.
Russell finished three tenths adrift of Leclerc while Hamilton, who made way for the team’s Danish junior driver Frederik Vesti in the opening running, was half-a-second back.
Mercedes’ sluggish pace also leaves the grid’s once-dominant team facing up to a winless season – their first since 2011.
In the day’s first running, British drivers Zak O’Sullivan, 18, and Jake Dennis, 28, made their Formula One weekend debuts for Williams and Red Bull respectively.
Ollie Bearman, 18, who in Mexico became the youngest British debutant at a Grand Prix, was handed his second practice appearance by Haas.
Dennis, in Verstappen’s Red Bull machine which Hamilton has described as the fastest ever seen in F1, finished 16th of the 20 runners, 1.1 sec off the pace.
O’Sullivan was 18th – seven tenths behind Williams’ Logan Sargeant – with Bearman 20th and last, albeit only a tenth slower than Kevin Magnussen in the other Haas.
Norris 'not comfortable' despite setting pace in Belgium practice
Lando Norris admitted he was "not comfortable" despite being fastest in the Belgian Grand Prix second practice.
McLaren finished first and second on Friday, with Norris finishing just 0.215 seconds ahead of team-mate Oscar Piastri.
Max Verstappen finished third, but despite an impressive performance, his 10-place grid penalty will affect his result.
Norris finished second in the Hungarian Grand Prix last week, behind Piastri, in a race overshadowed by a radio spat between the Brit and the pit wall.
Having put that behind him, even after a confident practice session on Friday, Norris is not willing to rest on his laurels with Red Bull showing their threat.
"Red Bull are very quick at the minute," Norris said. "So, tricky, but I've just not felt very comfortable today with the car.
"So hopefully I just wake up [on Saturday] and feel a bit more comfortable with it. But we'll try and improve a few things and see again.
"I know it looked good on the timesheets, but I've not felt super comfortable in just going out and doing it. So, hopefully, I can just get in a bit more of a rhythm and feel a bit better out there."
Meanwhile, Lewis Hamilton finished in 10th after struggling to match the pace set in the second session.
Mercedes have been credited for their improvement in recent weeks, with Hamilton winning at Silverstone before finishing third at Hungaroring last Sunday.
However, he was also left disappointed on Friday and said he was hoping for the forecast rain over the rest of the weekend to give the team more of an edge.
"It was a pretty bad day," Hamilton said.
"I don't really know what to say! Obviously, it's been feeling great in the past couple of races, but it just felt completely different today.
"We worked on it. The first session was not great, but then in the second session we made some changes, and it started off great, and then when I got to the soft tyre I just couldn't improve and there were a bunch of balance issues we had through the lap.
"It was better through this session, but everyone else went even better. So, to be 1.2s behind is not great.
"If it rains, then that opens it up a little bit and, hopefully, we can do a better job. I think the car should be better in the wet than it is in the dry."
Perez '100% certain' of Red Bull stay after Belgian Grand Prix
Sergio Perez is confident he will still be at Red Bull after this weekend's Belgian Grand Prix regardless of the result.
There has been a lot of speculation over the Mexican's future in recent weeks following a series of poor results at recent races, despite him signing a two-year extension with the team just last month.
Since coming fourth at the Miami Grand Prix in May, Perez's best finish has been seventh, both in Austria and Hungary, and he failed to advance beyond Q1 in four of the last six races.
His drop in form has allowed McLaren to close the gap to Red Bull in the constructors' championship to just 51 points.
With the four-week break soon approaching, both RB driver Daniel Ricciardo and Red Bull's reserve driver Liam Lawson have been linked with Perez's seat.
However, the 34-year-old is certain he will still be competing alongside Max Verstappen when the season resumes.
"I am 100% sure," Perez said.
"Because I know basically what's in my contract and I know what the team trusts in me. And I know where is the main focus, which is on delivering on the track.
"It's no different to what it was in Hungary or [at the first race] in Bahrain or how it will be in Zandvoort or the rest of the year," Perez said.
"Every single weekend we've got to deliver the maximum, especially now that, with McLaren catching up in the constructors, it's really important to put everything together if we can achieve it.
"I'm not worried about it. Like I said, I know where I stand. That's not my concern. My only concern I have is to get my season back on track. The rest, I'm pretty chilled about."
McLaren to discuss whether to prioritise Norris over Piastri, says Brown
McLaren chief executive Zak Brown has said meetings will take place to discuss whether to prioritise Lando Norris over Oscar Piastri for the remainder of the season.
The issue arose following last week's Hungarian Grand Prix, which saw Piastri's maiden win in Formula One overshadowed by Norris' radio spat with the pit wall.
Piastri had led much of the race before a bizarre pit-stop call by McLaren allowed Norris to take the lead, but was ordered to give the lead back to his team-mate.
Norris initially refused to do so, but with three laps remaining, handed the place back to the Australian as McLaren secured a first one-two since Monza in 2021.
Piastri's win at the Hungaroring made him the seventh different winner in 2024. It is the 16th different year with at least seven winners, the first since 2012 (eight).
But one of Norris' protestations before giving the position back was his battle with Max Verstappen in the Driver's Championship.
Despite scoring his eighth podium of the season in Hungary, the Brit remains 76 points behind the three-time world champion.
Brown, who wasn't on the pit wall in Hungary but is back for this weekend's Belgian Grand Prix, said the decision would ultimately fall to team principal Andrea Stella.
He told Sky Sports F1: "That's ultimately going to be Andrea's call. We want to get through the first half of the season, see where we end up this weekend.
"I think the Constructors' Championship, while it's definitely not going to be easy, is well within reach.
"I think the challenge on the drivers' front is Max's bad days are second and third places, so (it's difficult) to make those claw backs that we're making on the constructors' that we can do because (Sergio) Perez is struggling at the moment, we also know he's capable of turning it on at any moment.
"That will be something I think we discuss over the summer break."
McLaren's recent pace and form has seen them have a driver on the podium in the last nine races, cutting the gap to Red Bull in the Constructor's Championship.
The British team have another excellent opportunity to cut the gap in Spa, with Norris' championship rival Verstappen receiving a 10-place grid penalty for Sunday's race by exceeding his engine allowance for the season.
But the Dutchman topped the first practice on Friday, with Piastri finishing 0.531 seconds behind with Norris down in ninth, 0.512secs off his McLaren team-mate.
And Verstappen's showing has left Brown refusing to rule out the possibility of the three-time world champion claiming an eighth win of the season.
"It's a tricky track with how much downforce you want versus speed," Brown said.
"You have to assume Max is on for pole, which is P11.
"It would be a big mistake to think he can't go from P11 to P1 but we have to take every advantage you can."
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