We're coming up to Halloween and the nightmare for McLaren is that, despite an all-conquering triumph in the constructors' championship, the driver's title could yet slip through their grasp. The ominous sight of a four-time world champion eating away at the once sizeable gap Oscar Piastri and Lando Norris had atop the standings will be causing a real scare.
Max Verstappen "senses blood in the water", as Giles Richards put it in his Mexico preview, and recently his Red Bull has looked as fast as the McLaren, if not quicker. Autódromo Hermanos Rodríguez is a circuit Verstappen enjoys: he's won this race five times, though he didn't last year (he finished second to Carlos Sainz).
That said, in today's fascinating final practice, Verstappen was off the pace and only sixth fastest. Norris was quickest - by far - ahead of Lewis Hamilton and George Russell, as British drivers posted the top three times. Piastri was almost six-tenths down on his teammate, however.
Mexico is a unique track: located 2,240 metres above sea level, it's by far the highest altitude of any venue on the F1 calendar. The thin air has a hefty impact on the car's aerodynamics meaning even a Monaco-style setup will still see cars generate less downforce than at Monza. Translation: it's gonna be slippery.
Will Norris's final practice dominance result in pole? Can Piastri find some pace? Will Verstappen and Red Bull pull something out of the hat? Let's find out! Qualifying begins at 10pm (BST).