Sebastian Vettel is set to make a bold decision as he begins to face the reality of his title dreams coming to an end.
The German's hopes of a fifth Drivers' Championship could well be officially over on Sunday if the German can't beat Lewis Hamilton by at least a 17-point margin.
The Mexican GP could, at the same time, see Hamilton move level with his German rival on four titles which would crown him Britain's best driver in Formula 1 history.
But there is plenty of work to be done before either can assume their most likely of fates which F1 fans are expecting to be sealed at the Autodromo Hermanos Rodriguez.
Vettel and Red Bull's Max Verstappen claimed positions one and two on the grid, with Hamilton leading the row behind the front two, alongside teammate Valtteri Bottas.
It's expected to be a relatively standard day's work for Hamilton in Mexico, knowing that victory is by no means necessary to regain the title he lost to former teammate Nico Rosberg last season.
However, Vettel has warned that he and his Ferrari teammates are going to give everything to upset their greatest rivals, Mercedes, on what is expected to be a joyous afternoon for them.
Vettel outlines bold plan for Mexico
"[The championship] is not as much in my control as I would like it to be," Vettel admitted, per Sky Sports. "It depends on what Lewis is doing.
"We go all out. We'll attack and see what we can do. We deserve a good result. Ferrari deserves a good result."
The Italian outfit have slipped off the pace in the second half of the season after beginning it looking likely to end Mercedes's dominance in the Constructors' and Drivers' Championships.
Hamilton was happy to confess that, in qualifying, Vettel and Verstappen were just unable to be caught and outlined what his team need to sort before facing a circuit that is to their rivals' advantage.
Hamilton admits Mercedes behind in qualifying
"I gave it everything I could," Hamilton said. "Honestly, the last lap I could have been a couple of tenths quicker but I still wouldn't have been able to match these guys.
"The car balance was fine, we just needed more [pace]."
Mercedes have struggled in the recent past with high downforce, of which applies to the Mexican circuit - making for an interesting battle between themselves, Ferrari and Red Bull.
And Vettel is confident Ferrari's resurgence overnight, in qualifying, after Friday's struggles, is going to produce a great race - despite expectations of Hamilton to win the title.
"It was quite a lap I have to say," Vettel admitted.
"Friday wasn't that good for us in all honesty but overnight we improved, we had a lot of things we worked on and changed and they all worked.
"For now I'm really happy, we'll see what happens but the race pace should be really good."
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