The reigning champions enter a new regulatory era on the back foot, and early indications suggest the fight to defend both championships will be an uphill battle.
Pre-season testing painted a mixed picture for McLaren. Whilst the team demonstrated impressive reliability, completing 1,064 laps across the Barcelona shakedown and the two Bahrain tests, raw pace proved elusive.
Oscar Piastri's best effort of 1:32.861 placed McLaren second-fastest overall in the final Bahrain test, yet nearly 0.9 seconds adrift of Ferrari's Charles Leclerc.
Team principal Andrea Stella has been refreshingly candid, acknowledging that Ferrari and Mercedes are "a step ahead" heading into the Australian opener.
McLaren will start the season "playing a bit defensively," aiming to "exploit the counterattack" rather than dictating terms from the front.
Lando Norris echoed this caution, stating: "At the minute, we're a little bit off, so to match the race pace of some of the others, we have to push a bit more and then we have more degradation."
The British outfit is taking a more tentative approach to developments compared to its rivals, opting to focus on its core package before looking to introduce new parts.
Yet history warns against writing off the Woking squad. The 2026 regulations represent such a fundamental reset that development trajectories matter more than testing form.
McLaren's strength in tyre management could prove decisive as teams navigate the complexities of 350kW electric deployment and active aerodynamics throughout a gruelling 24-race calendar.
Whether it can defend its title for a third consecutive year, for now, remains frustratingly unclear.
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