Pre-Season Testing - Day 3 report: Mercedes dominates the last day in Bahrain

The sun has set on the first three days of Formula 1’s bold new era at the Bahrain International Circuit, and if the timing screens are to be believed, the silver arrows are back in business. As the chequered flag fell on the final session of the opening pre-season test for 2026, it was the teenage sensation Kimi Antonelli who sat atop the pile, leading a Mercedes 1-2 that will surely settle some nerves back in Brackley. However, as is always the case with testing, the headline times only tell a fraction of the story. Beneath the floodlights of Sakhir, a narrative of reliability concerns, technical adaptation, and a tantalizingly close pecking order began to emerge.

Mercedes finds Its feet amidst a ‘reality check’

George Russell, who topped the morning session with a 1m 33.918s, was candid about the team's progress. Speaking to the media during the lunch break, Russell noted that the week had provided a bit of a “reality check” for the team following their optimistic start in Spain. “He says he reckons they’ve still got a good car and there’ll be a few new bits on the car next week but nothing major,” reported the pit lane experts. Russell also pointed toward Red Bull as a benchmark, highlighting the impressive performance of their new power unit.

However, the afternoon belonged to Antonelli. The young Italian, playing catch-up after losing significant time to a power unit issue on Thursday, finally found his rhythm. As the track temperature dropped to a more representative 27 degrees Celsius, Antonelli bolted on the softer compounds and lowered the benchmark to a 1m 33.669s. While performance runs in testing are often taken with a pinch of salt due to unknown fuel loads, the sight of both Mercedes cars at the top of the sheets suggests that the W17 has the inherent pace to compete at the front.

Ferrari’s form and the Hamilton factor

If Mercedes provided the late-day fireworks, Ferrari provided the consistency—until the very end. The Scuderia has enjoyed a remarkably productive test, with Charles Leclerc topping Day 2 and Lewis Hamilton putting in a mammoth shift on Friday. Hamilton, still adjusting to the scarlet cockpit of the Ferrari, completed 139 laps today, a total only surpassed by McLaren’s Oscar Piastri.

Hamilton spent much of the afternoon engaged in race simulations, at one point getting "feisty" with Alpine’s Franco Colapinto and Red Bull’s Isack Hadjar. The seven-time champion was seen shadowing Hadjar closely through the middle sector, testing the 2026 aero package’s ability to follow in dirty air. It was an encouraging sign for fans hoping the new regulations would improve wheel-to-wheel combat.

However, the day ended on a slightly sour note for the Tifosi. With just minutes remaining in the session, Hamilton’s Ferrari ground to a halt, triggering a red flag. While the team suggested it might be a fuel-related issue—common at the end of a long testing day as teams "run dry" to calibrate sensors—it was a reminder that even the most reliable packages are not immune to the 2026 learning curve. Despite the stoppage, Hamilton finished the day third fastest, just over half a second off Antonelli’s pace.

McLaren’s bulletproof reliability

While Mercedes and Ferrari grabbed the headlines, McLaren quietly established themselves as the reliability kings of the first test. Oscar Piastri was a permanent fixture on the circuit today, racking up a staggering 156 laps. When combined with Lando Norris’s 149 laps from Thursday, the Woking-based squad has managed a total of 422 laps across the three days—more than double the tally of some of their rivals.

The McLaren MCL40 looks to be a stable, well-balanced platform. Piastri’s afternoon was dedicated to long-run simulations on the C3 medium and C1 hard compounds, focusing on tyre degradation under heavy fuel loads. Chief Designer Rob Marshall sounded a note of cautious optimism regarding the competitive spread of the field: “I thought there was a very high chance that somebody was going to come along with some package that aces it from the off, and it looks like that hasn’t happened. It looks like there are a good gaggle of cars that are very competitive.”

McLaren’s ability to run uninterrupted is a testament to their preparation. Having transitioned from a team that struggled at the start of the last regulation cycle to World Champions, they appear to have carried that momentum into 2026. As Marshall noted, “It looks like no-one’s going to run away with it, so it’s going to be a long haul.”

Midfield mysteries and rookie watch

While the "Big Four" of Mercedes, Ferrari, Red Bull, and McLaren seem to have a slight edge, the midfield remains a complete enigma. Williams, despite missing the initial shakedown in Barcelona, has been remarkably productive. Alexander Albon and Carlos Sainz combined for 136 laps today, bringing their three-day total to an impressive 413. The Grove-based team hasn't chased lap times, but their reliability suggests they have a solid foundation.

At Racing Bulls, Liam Lawson completed a full day in the cockpit, hitting the century mark with 120 laps despite a minor spin at the final corner. The team is the only one running a true rookie this year in Arvid Lindblad, though it was Lawson who did the heavy lifting today. The Kiwi driver seems comfortable with the Red Bull Ford Powertrains unit, which Russell earlier identified as a potential standout.

Alpine and Audi also had productive, if less flashy, days. Franco Colapinto bagged 138 laps for Alpine, a vital experience for the Argentine who is looking to establish himself as a full-time force. Audi, meanwhile, saw Nico Hulkenberg and Gabriel Bortoleto work through a methodical program, though they remain slightly off the pace of the leaders for now.

Reliability woes: Cadillac and Aston Martin

Not everyone enjoyed a smooth Friday. Cadillac, the sport’s newest entry, suffered its second on-track stoppage in as many days. Valtteri Bottas brought out the red flags in the morning session, leaving the team playing catch-up for the remainder of the day. While Bottas eventually returned to the track, the lost time is a blow for a team still finding its feet in the pinnacle of motorsport.

Aston Martin also looks to have work to do. Lance Stroll was in the car all day but only managed 70 laps—less than half of Piastri’s total. The team has been experimenting with various engine cover designs and cooling solutions, but their total lap count of 206 over three days is the lowest on the grid. For a team with championship aspirations, the lack of mileage will be a major concern heading into the second test.

Looking ahead to next week

As the teams pack up their garages and head back to the factories for a long weekend of data crunching, the focus shifts to next Wednesday. The second and final pre-season test will also take place here in Bahrain, and it is there that we expect to see the "true" 2026 pecking order emerge.

Upgrades are already on the way. Ferrari has confirmed a planned development program to build on their launch-spec car, and Mercedes is expected to bring "new bits" to address the balance issues Russell noted. With the season opener in Melbourne looming, the pressure is on to turn data into performance.

The first test of 2026 has proven one thing: the new regulations have successfully reset the clock. While the familiar names are at the top, the gaps are small, the technology is temperamental, and the racing—if the practice starts and following-drills are any indication—promises to be spectacular. As Lando Norris put it after his own successful stint: “There’s still things we need to fix and get our heads around and maximise, but on the whole I feel like if I went to a race now I’d have a pretty good understanding of everything I need to do.”

The countdown to Australia has officially begun.