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Early Ederson save turned out to be crucial
Watford started out the better side and had a chance to open the scoring against Manchester City when Gerard Deulofeu played in Roberto Pereyra who only had to place the ball past Ederson to send the Hornets ahead.
However, the Brazilian shot-stopper saved from point-blank range to keep the score level.
The Citizens scored two goals before the break and added four more after half-time to win 6-0.
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Timely David Silva goal sets City on their way
Having tried, and failed to score his first goal since the turn of the year, David Silva finally broke his duck with his strike just before the half-hour mark.
The Spanish midfielder sent a left-footed effort past Heurelho Gomes to put the favorites in front, and there was no stopping Pep Guardiola's side from that point.
Silva had been stuck on nine goals for the season for what seemed like an eternity, but the playmaker picked the best moment to hit his 10th goal of the campaign.
Raheem Sterling returned to his best
After a few quiet performances to close out the season, the forward was back to his best in City’s 6-0 win over Javi Gracia’s side.
The Englishman assisted Silva’s goal before scoring from close range to send the Premier League champions two goals up before half-time.
He was also in the right place to finish from close range after Bernardo Silva's quality ball into the box to make it five, before scoring another in the game's closing stages to seal a 6-0 victory.
Sterling’s hat-trick took his tally for the campaign to 26, and he’ll be delighted to end the year on a high.
Kevin De Bruyne was majestic off the bench
The Belgian had suffered a few injuries over the course of the campaign, so when he was sent on by Guardiola, he came out to make an impression.
And he did just that, scoring City's third in the 61st minute, before assisting Gabriel Jesus' strike seven minutes later.
His influence on proceedings was just what the City boss wanted and the attacking midfielder will wish for an injury-free campaign next term.
- Mike Hewitt
Relentless winner Guardiola made history
No manager had ever claimed a domestic treble in England, not even Sir Alex Ferguson who once claimed it was 'impossible', but the unrelenting Guardiola made history by becoming the fiirst to win all three available titles in one season.
The Spaniard's City side won the Carabao Cup, Premier League and FA Cup in what has to go down as one of the greatest campaigns from any side in the country.
They are by no means done yet and will do everything to retain all three trophies next season.