By SABC Sport
23rd December 2023
It was the club's fifth trophy of a memorable 2023 after their previous successes in the Champions League, Premier League, FA Cup and European Super Cup.
Julian Alvarez began the rout after just 40 seconds, teed up another for Phil Foden and then wrapped up a one-sided victory in the closing minutes. City also benefited from an own goal as they overran their Brazilian opponents.
City manager Guardiola, who had previously won the competition three times, told the clubs website: I am so proud of this club. What we have done is an outstanding achievement.
"To win this trophy is to be the best team in the world and our players, our coaches, our backroom staff, all of them work hard every single day to bring us this success.
"As a manager what I am most proud of (is) that we are always there. No matter how much we win, no matter what trophies we lift, we are there again to fight for the next one.
"To win the treble was truly special but to win two more trophies and now hold these five major titles shows the unique mentality of this team, of the club and its fans.
"It is something no other English team has ever achieved and we will always remember this incredible time we spent together."
Foden, whose cross also forced the own goal, similarly hailed a momentous night in the club's history.
The England midfielder said on TNT Sports: "We are not used to playing in this heat so it was difficult but we are delighted with the outcome. We're over the 'world'.
"This one is so important for the club. It's the first time we've won it. We're delighted and it's massive for the club."
Foden felt Fluminense, the Copa Libertadores winners, gave City a tough night.
"It was an unbelievable match," he said. "Fair play to them, the way they play. I love the way they play - short passes.
"They are a great side and they didnt make it easy but I thought the lads not only showed quality but heart and determination."
The one major concern for City was an injury to midfielder Rodri after a bad challenge from Fluminense's Alexsander but the Spaniard, who limped off in the 74th minute, said it was not serious.
Rodri told Sky Sports: "I was very lucky to be honest. I think it was one of the worst tackles I have had in my career.
"It was so scary because I felt my knee, but fortunately it was nothing. I was very close to crying because it was very worrying but it is nothing."