By being crowned champions at this point in the season, City have equalled the Premier League record for the earliest win.
But sealing the silverware thanks to a slip from old enemies United and their boss Jose Mourinho - a long-time rival of Guardiola - was a sweet moment, especially after they lost to their neighbours in the Manchester derby last weekend.
City have a 13-point lead over second-placed Manchester United with six league games left but have been jolted by a run of three straight defeats in all competitions. There's also the fact all those remaining games look very winnable in any case.
Defeat for Spurs handed Chelsea a glimmer of hope in the fight for Champions League places after it came from 2-0 down to beat Southampton 3-2, but Liverpool strengthened its position in the top four as Mohamed Salah scored his 40th goal of the season in a routine 3-0 win over Bournemouth. "Then the first time you lose one, you think you're never going to win another ever again".
"Anyway, City had thrown money at it before and didn't play like this prior to Pep's arrival".
Manchester United's record of winning the league with a point difference of 18 points. They are able to win their games - all six.
I'm buzzing, over the moon, so happy and proud to be able to share this with all of our fans, everybody who's been there to support us especially in this last week as many know it's been very hard but at the same time we've bounced back, we're champions now and thank you to all of you, It's an incredible season.
"I've never been able to retain the title so I want to see if this team has got it in them to carry on and be even more successful". City defender Benjamin Mendy, who missed most of the season due to injury, turned social media blue as he tweeted: "We are f*****g champions congratulations boys!" They lost only two matches because they were the best team. I was unfortunate enough to play against that quality United side that dominated in the '90s, but this side would have beaten them - that's how good they are. "One of the things we have to improve is our consistency".
"They won the title because they were the best team, because they won a great amount of points". It's good for the Premier League as well.