Max Verstappen took victory in the Mexico Grand Prix, but the day belonged to Lewis Hamilton, who survived an early clash with Sebastian Vettel to win his fourth world title.
Lewis got passed Vettel into Turn 2 but was tagged by Vettel, who has already made contact with Verstappen.
Lewis limped back to the pits with a puncture, dropping right to the back, but there followed a superb recovery drive, dicing with Fernando Alonso in the final laps to take ninth at the flag and secure his fourth world title - and the team's fourth consecutive Drivers' Championship.
"To be honest, this fourth world title is not even registering right now," said Lewis. "There is all this energy from the people around you, but it takes a while for it to really sink in.
"I feel incredibly grateful when I think about everything that has gone on this year and everything that had to be in place to produce this result.
"I didn't do this on my own, there are over a thousand people back in Brackley and Brixworth who have created this beast that has given me the opportunity to exploit my abilities.
"I have received such great support from around the world, and I want to thank all of you that believed in me.
"To do this on Mexican soil, to shine a positive light on a country that has been through such a difficult time over the past few months, makes this really special.
"It doesn't matter what happened in the race today. I carry 'Still I Rise' on the back of my helmet - it means when you get knocked down, you get back up again and keep pushing as hard as you can. I never gave up, and I kept pushing. Four is a great number - but I want number five now!"
Valtteri survived the first lap contact to take a comfortable second behind Verstappen - his best ever result at the Autódromo Hermanos Rodríguez - and cut the gap to Vettel in P2 in the Drivers' Championship to 15 points with two rounds to go.
"The right man won the title this year, Lewis absolutely deserves this!" said Valtteri. "He's my team mate, so I know he's not only talented, but also a hard worker, and a really nice guy.
"Even though we're competing, I'm also happy for him - but I still want to beat him next year.
The race today was pretty straightforward after the start. I saw in Turn 2 that Max and Sebastian were side-by-side, and one of them went a bit wide, so I knew Turn 3 was going to be a mess.
"I decided to go inside and cut the corner and get a good exit. After that there was not much happening. Unfortunately, we couldn't challenge Max today, so I drove it home.
"We saw we didn't have the pace to win the race, so we have a lot of things to learn. But overall, it was not a bad day for us - I felt I got the most out of the car, it was good to be on the podium after such a long time, and of course Lewis won the title."
In a year of up and downs, Mercedes-AMG Petronas Motorsport boss Toto Wolff was delighted on a job well done, as the team wrapped up a fourth consecutive clean sweep of the world titles.
"This was the hardest championship ever, but it was also extremely well deserved," said Toto. "We had quite some up and downs this season with the new cars and tyres. We had to accept the fact that this is the reality now, and to progress was very difficult for the team and really took the maximum out of us.
"Lewis probably showed the best and most constant performance of his entire career this season, he has made a step forward in every respect and there is no doubt whatsoever that today the right man was crowned world champion today.
"While the result was good, the race was not what we had hoped for. But I'd like to just look at the positives today and not dig into a controversy that is not necessary at this stage - Lewis won the championship!"
Technical Director James Allison summed up the thoughts of the Silver Arrows perfectly, agreeing that the team couldn't be prouder of Lewis on his fourth world title triumph.
"We knew that the championship arithmetic favoured us going into this race," said James. "But that didn't mean that it was a comfortable afternoon after the melee of the first corner - either for us sitting on the pit wall with all the information at our fingertips but much more for Lewis who had the lonely task of picking his way back through the field from stone-cold last.
"In truth, as long as the front stayed reliable, this looked like Lewis was safe throughout, especially since Valtteri drove very capably, holding down a very assured second place. But you can't rely on that and so we were very keen to get Lewis up into 9th place and it was an amazing achievement for him to do that at this track which is so difficult to overtake at.
"It's a great feeling for us after sealing up the Constructors' Championship last week to come here and finish the championship that the rest of the world really cares about and to make sure that Lewis was crowned champion for the fourth time.
"It's hard to imagine a season where the champion has more richly deserved the spoils. It's been a brilliant, competitive, inspiring year of motorsport and Lewis has been the one constant throughout. We couldn't be happier for him."