Kimi Antonelli can leave Austin as Formula 1's youngest World Champion, but the size of his championship lead should not be confused with the likelihood of settling it this Sunday. The title is within reach; the combination of results needed to secure it in Texas is much less comfortable.

The Mercedes driver must win the United States Grand Prix, with George Russell ninth or lower and Lewis Hamilton fifth or lower. All three conditions must be met. Second place for Antonelli is not enough, even if Russell fails to score.

Antonelli is treating that as an opportunity rather than an expectation.

For me [it] needs to be a perfect weekend and the others, they need to do a poor result, which is unlikely to happen, he said during Thursday's media day, in comments reported by Formula1.com.

That is the important distinction behind the calculations. Antonelli controls his own performance, not where his teammate and Ferrari's seven-time champion finish. Even a victory could leave the champagne waiting for another weekend.

Russell has already acknowledged the broader reality of the championship.

Whether it's this weekend or next weekend, it's a matter of when, not if, he clinches it, he said.

That is a concession about the season, not a promise to make Sunday's arithmetic work. Russell can postpone Antonelli's celebration simply by finishing eighth, even if his teammate wins. Hamilton can do the same by finishing fourth.

There is also the task of winning the race in the first place. Max Verstappen arrives after victories in Malaysia and Singapore, while Ferrari and McLaren have brought further aerodynamic changes to Austin. A championship lead does not buy an exemption from racing them.

Verstappen's finishing position would not otherwise prevent an Antonelli clinch if the Italian wins: second place would leave the Red Bull driver too far behind. But taking the victory himself would shut the door on an Austin coronation immediately.

Antonelli starts the weekend on 340 points, 102 ahead of Russell and 111 clear of Hamilton. A win would take him to 365. With five races and 125 points then remaining, Russell could score no more than two points and Hamilton no more than 10. A 125-point lead over Russell would be sufficient because Antonelli would have the advantage on race victories if they finished the season tied.

Our earlier championship explainer sets out the complete calculation. The fresh question is whether the required results will arrive together, not whether the equation exists.

For now, an Austin clinch is possible rather than the result to expect. Qualifying and the race will provide the useful evidence. Antonelli can finish the job on Sunday, but he does not have to force the entire championship into one afternoon.