This is how it was meant to be.

When Mercedes announced in August 2024 that they were fast-tracking Kimi Antonelli - who had turned 18 just days earlier - into one of Formula 1's most desirable seats, expectations could not have been set much higher.

Fast-forward a little more than two years, and the Italian has delivered on his billing as a generational talent by becoming the sport's youngest world champion at the age of 20.

Even with expectations set so high, winning a title in just his second season in F1 has seen Antonelli surely exceed even the wildest dreams of Mercedes chief Toto Wolff.

But the most remarkable thing about Antonelli's triumph is the fact that this sporting fairy tale didn't initially go to plan, starting from the day before his signing was announced.

After Antonelli was crowned at the chequered flag of Sunday's Mexico City Grand Prix, Sky Sports F1 look back at his remarkable journey to this moment.

Shock Hamilton exit leads to Wolff gamble

Mercedes were left stunned in February 2024 when Lewis Hamilton announced that he had decided to leave the team he had won six of his seven championships with to join Ferrari the following year.

Once the dust had settled on the biggest driver transfer in the sport's history, Wolff's attention shifted to finding a new team-mate for George Russell, whose strong first two campaigns with the team had suggested he was a world champion in waiting.

The Austrian's top target appeared to be Red Bull's Max Verstappen, while the likes of Fernando Alonso and Carlos Sainz, who was making way for Hamilton at Ferrari, provided very solid and experienced options.

The wildcard for Wolff was Antonelli, who had been scouted by Mercedes as he dominated the European karting scene and signed by the team in 2019 as a 12-year-old.

Antonelli starred as he worked his way through the junior categories, so much so that Mercedes had him skip Formula 3 to go straight up to Formula 2 in 2024.

It's unclear whether Wolff had planned to loan Antonelli out to another team, as was the case when Russell, also a product of Mercedes' junior programme, spent his first three seasons in F1 at Williams, but the opening created by Hamilton's departure changed everything.

An unprecedented testing programme was arranged that allowed Antonelli big chunks of track time in Mercedes' cars from recent seasons. It was surely in those sessions, rather than a slightly underwhelming F2 campaign in which he finished sixth, that Wolff saw enough to convince him to roll the dice.

Some speculated that a factor in Wolff's decision was his regret at missing out on signing Verstappen as a teenager a decade earlier and wanting to ensure there was no way the sport's next generational talent would somehow end up in the clutches of a rival team.

Crisis point? Tears and 'underwhelming' Wolff

Antonelli was not only replacing the most successful driver in the sport's history in Hamilton, but the only real example of someone of his age being given a chance at a top team was when Red Bull promoted Verstappen from their junior squad during the 2017 season.

Even in that case, the Dutchman had 23 Grands Prix under his belt.

While it had become clear in the paddock that Antonelli had been chosen to partner Russell in 2025, Mercedes arranged a grand announcement around the 2024 Italian Grand Prix in Monza.

The plan was for him to make his first appearance in F1 practice on the Friday, before his signing was officially announced on Saturday. That is what happened, but only after Antonelli had destroyed the car by spinning into a barrier at high speed just 10 minutes into the session.

Six months later, Antonelli's first F1 qualifying session didn't go to plan either as he was knocked out of Q1 in Melbourne. But he would drive a mature race to fight back to fourth in the wet, and make a generally solid start to the season, with a Sprint pole position in Miami offering the first real glimpse of the speed that had been promised.

A first Grand Prix podium followed in Canada in June, but instead of pushing on from there, the Antonelli story reached its darkest moments.

There was the difficult sight of the teenage boy dabbing at his tearful eyes with a tissue as he attempted to conduct his media responsibilities in Belgium after an early qualifying exit, before Monza once more failed to provide any home comforts.

Having scored just one point across the five preceding races, Antonelli endured a torrid weekend at the Temple of Speed, which saw a crash in practice throw off his preparations before he finished ninth in the race. The Mercedes W16 car was far from best-in-field, but Russell had got it in the top five at five of those six races.

Wolff had been steadfast in his backing of Antonelli throughout the year, which meant it felt extremely significant when the Austrian was publicly critical of his young star for the first time.

"Underwhelming this weekend, underwhelming," Wolff said. "You can't put the car in the gravel bed and expect to be there. All of the race was underwhelming."

Wolff caveated his criticism by insisting he retained belief in his driver, but the comments raised doubts over whether Mercedes would persist with Antonelli if there wasn't an upturn in performance.

The tough love from Wolff appeared to work as Antonelli found some form to deliver a stronger final third of the year, with a memorable drive, once more in the wet, in Brazil providing a season's-best second-placed finish.

Antonelli arrives with five in a row

There was a major shift in the sport's landscape over the winter as the introduction of new chassis and power unit regulations effectively reset the playing field.

Having failed to contend for titles during the previous generation of rules from 2022 to 2025, Mercedes were installed as pre-season favourites, with paddock murmurings establishing a widespread belief that the Silver Arrows had aced their new engine - as they did in 2014 - and would start strongly.

While the change in competitive order of teams was anticipated, there was less of an expectation that alterations in driver performance could be similarly dramatic. For that reason, Russell was considered the clear favourite to claim the drivers' title.

While Russell lived up to expectations by taking pole position and winning the opening race of the season in Australia, perhaps more important in the long run was the second place Antonelli salvaged after an unnecessary crash in final practice threatened to leave him starting from the back of the grid.

Having avoided calamity, Antonelli took advantage of a little bit of luck as Russell suffered technical issues in Chinese Grand Prix qualifying to take pole, and backed that up by claiming the first race victory of his career a day later.

The result was the start of a streak that will live long in F1's history books, with Antonelli going on to reel off the first five victories of his career in successive races as wins followed in Japan, Miami, Canada and Monaco.

Russell was left dumbfounded. The title chance he had waited patiently for was suddenly being snatched away.

The Brit appeared in denial to begin with as he attributed the results to various external factors, but by the time Antonelli dominated and Russell finished 12th on a Monaco weekend where few expected Mercedes to win, it had become clear to all that the generational talent had well and truly arrived.

Wolff recently reflected: "It's been 30 or more years that I've tried to understand racing drivers' brains, and I still don't know what has happened (to Antonelli) over the winter. His ability to process and deliver something that's outstanding, which we didn't see coming."

Monza magic and Austin excellence close the show

However, winning a title rarely comes without adversity, and it struck during the European summer as an engine failure took Antonelli out of a podium finish in Barcelona, before a wheel-guard failure denied him a potential victory at the British Grand Prix a few weeks later.

Russell was back within 25 points, while Hamilton was also in striking distance a further seven points adrift, and Mercedes were no longer as dominant as they had been in the early stages of the season.

With the pressure on, Antonelli responded by winning the next race in Belgium and then delivering podiums either side of the summer break to rebuild his lead, but the best was still to come.

Unlike a year earlier when Oscar Piastri had appeared on course for his maiden title before suffering a dramatic loss of form and finishing third in the standings, Antonelli seemed to get better.

Given what had happened to Antonelli on his previous two appearances at Monza, it seemed there was a psychological element to a decision being made for him to take an engine penalty at the race, which would drop him to 19th on the grid, perhaps relieving the pressure that had hindered him at home in the past.

It turned out to be a masterstroke, as Antonelli scythed his way through the field to win with ease, producing a performance that belongs with legendary displays of the past: Verstappen in Brazil in 2024, Hamilton in Germany in 2018, Michael Schumacher in Belgium in 1995.

The drive alone was enough to make it the standout moment of this season, but there were two further elements that made it even more significant.

The result demoralised Russell, who had started from second on the grid, and made it a question of when, not if, Antonelli was going to close out his triumph.

And then there was the turning of the tifosi, Ferrari's fiercely loyal legion of fans in red, many of whom found themselves cheering for Antonelli and proudly singing the Italian national anthem as the boy wonder stood on the top step of the podium.

While it was less eye-catching than the Monza display, Antonelli would also produce a different type of brilliant victory at the United States Grand Prix as he overcame Mercedes' struggles with their new upgrade package to deny an in-form Verstappen pole, before producing an unexpectedly dominant race to win comfortably.

Antonelli could hardly be more popular within his Mercedes team, but the result was a massive moment for the Silver Arrows as it confirmed there is potential in the development path they've been pursuing ahead of a 2027 season where Red Bull and Verstappen look primed to return to title contention.

Wolff described it as Antonelli's "best race" in F1, before being reminded of what had happened in Monza seven weeks earlier. The Austrian admitted he may have been slightly forgetful, but insisted the performances belonged in the same bracket.

A megastar in waiting?

The mathematical equation after the Austin victory turned the Mexico City Grand Prix into something of a title parade for Antonelli, but he still overcame illness and nerves to produce a strong performance that earned him a podium finish in third.

While there was no crowning victory, the fairy-tale scene on the podium was near perfect as race winner Verstappen and second-placed Hamilton - the two most successful drivers on the current grid - hoisted Antonelli onto their shoulders, creating an iconic image that will live long in the memory.

The problem for the rest of the grid, and his team-mate Russell in particular, is that Antonelli should theoretically get better and better.

As Wolff explained in Austin, "the work of nine years" and more than £10m has gone into developing Antonelli. There is little doubt that both the team and driver himself will continue to leave no stone unturned in maximising his extraordinary talent.

Perhaps crucial to that process has been Mercedes allowing Antonelli to act his age in some ways, with videos of him pranking his engineers and vice versa shared on the team's social media channels throughout the season.

While Mercedes have created a familial environment for Antonelli to thrive in, credit must also go to his own parents, who have raised a young man who has achieved the remarkable feat, at least to this point of his career, of being almost universally popular.

His father Marco, a former racing driver himself, has been an ever-present in the paddock, but has also taken enough of a step back to allow an extremely close father-son relationship to flourish without creating too many challenges for the team.

You'd be hard pushed to find anyone in the paddock - driver, team boss or journalist - who would have a bad word to say about Antonelli, who does just about everything with a smile on his face.

Even McLaren team principal Andrea Stella, whose squad were constructors' champions in 2024 and 2025, spoke of his pride and excitement as an Italian at seeing what Antonelli is doing.

Away from the paddock, Antonelli's age and charm have made him extremely popular with younger fans of the sport, and he will surely continue to bring new followers in Italy and beyond.

With Italy's passionate fans desperate for a new hero amid their men's football team's continued slump and tennis star Jannik Sinner struggling with injuries, Antonelli is quite possibly about to become the nation's most popular sporting figure.

If F1 bosses had any fears over the sport lacking some star power when Hamilton eventually retires, the emergence of Antonelli will have them sleeping easier, with global superstardom an inevitably if he continues on this path.

The other question that probably won't go away until it happens, whether that's in five, 10 or 15 years, is whether Antonelli will follow in Hamilton's footsteps by moving from Mercedes to Ferrari.

Enjoy the ride.