Kimi Antonelli had the Brazilian GP won until lap 20, when a sudden spin at Turn 1 handed the race to Lando Norris and cost Mercedes a double celebration on the day they clinched the constructors' title. The newly-crowned world champion dominated early, pulling clear on intermediates before switching to slicks. But he reported something "weird" with the car's rear geometry — instability in left-handers, especially high-speed ones — that gave no warning before the spin. Flat-spotted tyres from the slide dropped him behind Isack Hadjar and Max Verstappen. A second soft-tyre stint brought the pace back, but the win was gone. Antonelli suspects a suspension or geometry issue materialized only after the slick switch; the team hasn't found a clear cause yet. He's putting the frustration aside to celebrate the constructors' crown, but this one stings — Interlagos punished a car problem he couldn't drive around. Mercedes will need answers before Vegas.
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