Aston Martin's Lance Stroll set the unexpected pace in the only practice before Friday morning's Sprint Qualifying at the Chinese GP in an intriguing session which was briefly interrupted by a bizarre grass fire.
With F1 cars running around the vast and fast Shanghai International Circuit after a five-year absence at the start of the season's first Sprint weekend, teams appeared to take differing approaches to the hour of running with alternative strategies for tyres and, seemingly, fuel loads evident through the field to create an unusual-looking final timesheet.
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World champion Max Verstappen had led much of the session for Red Bull, on medium and then soft tyres, but was overhauled in the closing minutes as track conditions evolved - first by McLaren's Oscar Piastri and then Aston Martin's Stroll.
Stroll's fastest time of 1:36.302 was 0.327s quicker than Piastri's, with Red Bull's Verstappen a further 0.021s adrift.
Sergio Perez was fourth in the second Red Bull but the feeling that the timesheet did not tell the true story of the weekend's likely pecking order was heightened by the appearance of both Haas cars, Nico Hulkenberg and Kevin Magnussen, and Alpine's Esteban Ocon in the top six.
Ferrari, Red Bull's closest challengers so far this season, ran the soft tyres early in the session and eventually slipped out of the top 10, while Mercedes were the only team not to run either the soft or the medium compound.
As part of 2024's revised Sprint weekend schedule, teams will now immediately prepare for Sprint Qualifying at 8.30am, the 44-minute session that sets the grid for the 19-lap Sprint race, which takes place at 4am on Saturday.
All sessions from the return of the Chinese Grand Prix - including Saturday's main Qualifying session at 8am and then the Grand Prix at the same time on Sunday morning - are live on Sky Sports F1.
Grass fire, Hamilton's pit mix-up, amid pecking order guessing games
F1 is back in China for the first time since the Covid-19 pandemic and, while the venue is familiar to most in the sport, the appearance of the Shanghai track surface had nonetheless surprised drivers and teams during their circuit walks on Thursday.
Some had initially thought the surface featured darker painted sections but it emerged that those patches were actually a bitumen treatment, which is designed to prevent disintegration and eliminate dust.
However, while the track perhaps did not quite prove quite as grip-less as feared when practice commenced on Friday despite a few minor early off-course moments for drivers, it was soon the grass on the inside of the track that was causing more concern.
It was a quarter of an hour in to running when a small fire suddenly broke out on a patch of grass on the inside of Turn Seven. Race Control threw the red flag, with cars returning to the pit lane, to allow marshals the chance to put the fire out with extinguishers.
The matter was swiftly resolved with a scorched section of grass left to show for the bizarre incident when cars returned to the track minutes later.
While highly unusual, it appears a spark generated by a titanium skid-block on the underside of a car while hitting the ground through the high-speed section may have been the culprit amid dry but windy conditions in Shanghai after rain earlier in the week.
When the session resumed, Hamilton found himself involved in a strange incident which saw him receive a black-and-white warning flag from Race Control.
The Mercedes driver had been preparing for a timed lap as he approached the final corners and was overtaken by Verstappen into the hairpin, with Hulkenberg then trying to get around the outside but squeezed over the exit kerb.
Piastri was ahead of them on the short straight to the final corner but, while Verstappen got through into the left-hander, Hamilton did not and then jinked right and instead took to the pit lane instead.
However, by doing so Hamilton contravened the race director's event instructions by crossing the white line on the pit-lane entry, earning him the black-and-white flag.
Hamilton finished 18th on the timesheet, with team-mate George Russell 17th, after Mercedes were the only team to exclusively run the hardest, and slowest, tyre compound through the session.
Fernando Alonso, pacesetter Stroll's Aston Martin team-mate, did likewise.
Ferrari only ran the soft, which they first used at the start of the session when the track had less grip, with Charles Leclerc and Carlos Sainz finishing up in similarly unrepresentative 13th and 14th places respectively.
Alpine's Pierre Gasly did use the soft compound but still ended up slowest of all, with the Frenchman bemoaning his "not acceptable" session over team radio at the end of the hour by saying he had learnt "absolutely nothing" about the car.
Sky Sports F1's live Chinese GP schedule
Friday April 19
8am: Chinese GP Sprint Qualifying (session starts at 8.30am)*
Saturday April 20
3.30am: Chinese GP Sprint (race starts at 4am)*
7am: Chinese GP Qualifying build-up*
8am: Chinese GP Qualifying*
10am: Ted's Qualifying Notebook*
Sunday April 21
7am: Grand Prix Sunday: Chinese GP build-up*
8am: The CHINESE GRAND PRIX*
10am: Chequered Flag: Chinese GP reaction*
11am: Ted's Notebook*
*also live on Sky Sports Main Event
You can watch every session of the Chinese Grand Prix live on Sky Sports F1 and steam every F1 race and more with a NOW Sports Month Membership - No contract, cancel anytime
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