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.