Red Bull's Sebastian Vettel clinched his fourth consecutive world title with a victory in the Indian Grand Prix.
The German drove a perfect race to secure his sixth consecutive victory this season and become only the fourth man in history to win four titles.
Vettel joins legends Juan Manuel Fangio, Alain Prost and Michael Schumacher.
The victory keeps Vettel on target to equal the all-time record of nine consecutive F1 world championship wins.
Vettel's Red Bull team also won the Formula 1 constructors' championship for the fourth consecutive year.
"I'm speechless," said Vettel. "I don't know what to say, I crossed the line and I was just empty. You want to think of something to say and I just can't. It has been an amazing season, the spirit in the team is great and it is a pleasure to jump in the car and drive."
He only needed a fifth place to be sure of the title no matter what his only remaining rival Fernando Alonso did, while the Spaniard had to finish in the top two to have any chance of taking the championship to the next race in Abu Dhabi next weekend.
Wild celebrations as Vettel wins title
But those hopes were over by the first corner, when Alonso was clipped by Vettel's team-mate Mark Webber, who was knocked sideways by Kimi Raikkonen's Lotus.
The touch damaged Alonso's front wing, and he had to stop for a new one on lap two, wrecking Ferrari's strategy of starting on the harder 'medium' tyre and running a long first stint. He fought back to 11th place.
Webber was on the same strategy, while Vettel was among those who chose to start on the 'soft' tyre and make an early pit stop.
The German did so on lap two, rejoining in 17th place, leaving him needing to carve quickly through the field to ensure he could race for victory with Webber.
Vettel did so brilliantly, moving up to third place by lap 13, and second behind Webber by lap 21, by which time he was 11.8secs behind the Australian.
Webber made his first pit stop on 28, and surprisingly Red Bull fitted the 'soft' tyres for a short middle stint, rather than saving them to the end of the race when Vettel used a similar strategy in China.
It was not the absolutely ideal strategy but it made no difference. Webber had already lost the race by then thanks to his poor first lap and Vettel's impressive drive back through the field.
Vettel made his second pit stop, for another set of mediums on lap 31, and Webber was in the next time around, rejoining 13 seconds behind Vettel.
The race for victory was already effectively over, and it was decided for good when Webber pulled off on lap 39 with an alternator failure.
Sebastian Vettel has now won four titles in a row
Asked about Red Bull's decision to fit soft tyres at his first stop, Webber said: "You have to protect against the safety car. It's a bit nicer to put the primes on and save the options to the end, but it gets a bit smelly if there is a safety car."
That is a reference to the requirement to use both types of tyres during the race and that if Webber had still been on mediums had a safety car period happened in the second half of the race he would have been at a strategic disadvantage and lost a lot of positions.
Vettel celebrated by doing 'doughnut' spins on the pit straight, before bowing to his car and abandoning it there against protocol.
Mercedes driver Nico Rosberg took second place, ahead of the Lotus driver Romain Grosjean, who did a one-stop race, running way beyond the maximum amounts of laps recommended by Pirelli before the race.
These were 35 laps on the medium, while Grosjean ran 46.
The Frenchman caught his team-mate Kimi Raikkonen with four laps to go, and passed his team-mate at Turn Four but had to give up the place again because he completed the move by running off the track.
Raikkonen then let him by between the final two corners after being told to let Grosjean by. The Finn, struggling to get his tyres to the end after stopping on lap seven, was then immediately demoted to fifth place by Ferrari's Felipe Massa.
Raikkonen lost two further places to McLaren's Sergio Perez and Mercedes' Lewis Hamilton, the Englishman also being passed by Perez in the same move, before the Lotus driver finally had to give up on his tyres and make a late pit stop.
Perez finished fifth ahead of Hamilton in by far his best performance for McLaren, and one that may secure his future at the team next season.
Raikkonen rejoined from his pit stop to take seventh ahead of Force India driver Paul Di Resta, whose team-mate Adrian Sutil fought off Toro Rosso's Daniel Ricciardo and Alonso in the closing laps.