The victory matched the competition's record final win - set when Bury beat Derby County 116 years ago - and was the flawless end to an unbelievable season for unarguably one of the finest teams to grace the long history of the English game.
But, the domestic treble still remains a possibility, with Pep Guardiola's men already lifting the EFL Cup and the Premier League trophy. He left Sergio Aguero and Kevin de Bruyne on the bench, electing to start Riyad Mahrez and Gabriel Jesus.
"It's one of the best seasons I have experienced as a manager", said Guardiola, who won titles previously at Barcelona and Bayern Munich. "The players deserve all the recognition". That's because Manchester City has beaten Watford in its last 10 matches across all competitions, which includes a 3-1 victory at the Ethiad in March.
"I grew up here and saw this stadium get built. That is something we need to address because it is still our dream to win it". "He said we needed to get the mentality right and we did that and did it exceptionally well", Sterling said.
City chairman Khaldoon Al Mubarak also confirmed that there will be a testimonaial for Kompany next September, adding: "There have been many important contributors to Manchester City's renaissance, but arguably none are more important than Vincent Kompany".
It always looked a long shot for them to deliver a classic Cup upset. The draw is +565 after 90 minutes plus injury time, and the over-under for total goals scored is three.
It could have been very different for the Hornets had Roberto Pereyra not missed the first big chance of the game when he fired too close to Ederson with just the City goalkeeper to beat.
Mahrez nearly made it three when he skipped away from Holebas and thumped an angled shot, but Watford rallied and Kiko Femenia won a corner that sparked momentary chaos before City cleared. They doubled their lead just before half-time (through Raheem Sterling's cheeky finish) and Watford's task grew exponentially. As the Sky Blues flooded men forward, Watford broke with drive.
Goal! Bernardo Silva with a ideal pass to the back post and Gabriel finds the back of the net from a tight angle! It's the first time a Premier League club has won back-to-back titles since Manchester United did so in 2007-08.
FW Bernardo Silva, 9 - He was crucial to the opening two goals with his hard work winning the ball and then vision to produce a pass. "Next season we will try again". Instead it will be Wolves who start their season in July, with the berth in the Europa League second qualifying going to seventh in the Premier League.