Lewis Hamilton clinched the Formula 1 world championship with two races to spare on Sunday at Mexico City, by scraping home ninth after a bruising encounter with title rival Sebastian Vettel.
Mercedes ultimately topped both points tables for the fourth straight season, but the way this one played out was nothing like the previous three in the V6 hybrid turbo era.
Vettel and a rejuvenated Ferrari properly carried the fight to Hamilton and Mercedes, taking full advantage of the 2017 rulebook's extra aerodynamic freedom to close the yawning chasm between the Silver Arrows and its nearest rivals.