City took their time to break Watford down.... but once they did the outcome was never in doubt.
- Man City XI: Hart, Sagna, Mangala, Kompany, Kolarov, Fernandinho, Yaya Toure, Silva, Sterling, Navas, Aguero
- Watford XI: Gomes, Nyom, Prodl, Cathcart, Holebas, Behrami, Capoue, Jurado, Ighalo, Abdi, Deeney
A few handbags between Kelechi Iheanacho and Watford's Valon Behramii after they battle for the ball - but that is the nearest we have come to any late drama here.
City are still content to sit back on their lead. Watford are seeing a lot of the ball but they are still yet to test City keeper Joe Hart.
Time for another City change. Kelechi Iheanacho is coming on for his debut, replacing Raheem Sterling... who departs to loud applause after opening his account for his new club.
Credit to Watford, they are giving this a go but City's defence is not exactly wobbling.
Watford have not had a single shot at goal today, either on or off target - all four of their attempts have been blocked. It is very hard to see them turning this game around with 10 minutes to go.
A final change for the visitors. Ben Watson, who scored the winning goal for Wigan against City in the 2012 FA Cup final, is on for Etienne Capoue. I don't see any similar late heroics happening from him this time...
Just as I write that, City come forward again and Yaya Toure fizzes a shot a few inches wide. The home side are in complete control of this match now.
Safe to say that City don't look too bothered about extending their lead. David Silva, who has been exceptional again this afternoon, is replaced by Fabian Delph.
City are looking very comfortable here, and some of the scores elsewhere will make their fans even happier... especially the one from Stamford Bridge.
Another change for Watford, Miguel Layun is on for Odion Ighalo.
Hang on, maybe this game isn't quite over yet. Troy Deeney's clever dummy gives Ikechi Anya space for a shot and it takes a smart block from City defender Bacary Sagna to divert the ball to safety.
Sebastien Prodl takes out City striker Sergio Aguero and quickly finds himself in the book.
A first change for Watford. Ikechi Anya is on for Almen Abdi. A big ask for him to change the direction of this game though.
The Hornets have no choice but to get forward now but they are leaving gaping holes behind them when they do. City break and Bacary Sagna would be in if Raheem Sterling had got the correct weight on his pass.
It's still early days, of course... and this game is not over yet... but things are looking very good indeed for Manchester City right now...
Man City are not finished yet by the looks of things. This time Raheem Sterling turns provider, with a low cross from the right, but Sergio Aguero slips as he tries to turn it home and scuffs his shot horribly.
Well, Watford do open up... but not in the way they would have wanted. After Yaya Toure's free-kick is charged down, David Silva plays a precise pass to Fernandinho, running into the area down the right... and his bullet finish flies into the opposite corner of the net.
Hmmm, not much of a response from Watford so far. Troy Deeney has pushed up a bit but his team-mates are still sitting very deep - surely they will have to open up eventually.
Nineteen passes in the build-up to that Raheem Sterling goal for Manchester City, as shown below. Not sure where the Watford defence was either.
Former Wales striker on Final Score
"Watford switch off - it's far too easy for Sagna to get the ball in. Sterling makes a great run across the near post and it's a very deft finish."
This is the first time Watford have been behind this season. How will they react?
City changed their shape at the break with David Silva going wide right and Samir Nasri on the left. Raheem Sterling was pushed up front in the middle alongside Sergio Aguero - fair to say the switch paid off.
Bacary Sagna swings in a cross from the right and Raheem Sterling is on the end of it to slot home his first goal for City since his £49m summer move.
We have picked up where we left off before half-time. City have the ball and all of Watford's players are behind it.
City get the second half started
City are bringing on Samir Nasri for Jesus Navas for the second half. You can understand why - a case of more guile needed, less speed.
Former Wales striker on Final Score
"Watford have dug in. They've made themselves difficult to score against, and Quique Flores will be delighted. But Manchester City are probing and probing and you just feel eventually they will break them down."
Manchester City are getting plenty of men forward, Watford.... less so. As you can see by the average position of their touches.
Hornets striker Troy Deeney is their number nine, but is spending most of his time deep on the right of midfield.
There will be one minute of added time at the end of the first half. Watford have succeeded in their mission of killing the game, so far anyway...
Watford right-back Allan-Romeo Nyom joins Vincent Kompany in the referee's book after clattering Raheem Sterling.
When play restarts, City come forward down the right and Jesus Navas lets fly with a shot that goes out for a throw. That sort of sums up the first half for the home team in front of goal.
The pattern of this game has not changed - Watford frequently have 11 men behind the ball.
Their nominal lone striker, Troy Deeney, is helping his right-back Allan-Romeo Nyom out whenever City come forward down the left, tracking Aleksandar Kolarov's runs.
City skipper Vincent Kompany is the first player to go in Mark Clattenburg's book, for a late lunge on Jose Manuel Jurado. Watford's free-kick from 40 yards out fails to beat the first defender though.
Sergio Aguero has been kept relatively quiet so far, but springs into life when the ball reaches him on the edge of the Watford area. He turns to fire in a stinging shot but Heurelho Gomes watches it zip wide of his left-hand post.
In case you've just joined me, this game is all about City's attack vs Watford's defence... and the defence is on top at the moment.
The frustration continues for City - they have had 60% of possession, but have not been allowed to test Heurelho Gomes too often.
The Hornets have not really threatened much at the other end, but that is always going to be tough when your striker is operating in a similar area to a defensive midfield player.
Almen Abdi has just curled in a cross from deep out on the right, but it was an easy catch for City keeper Joe Hart.
Just to reiterate - Watford are well organised and their game plan is working at the moment. City just cannot find the right pass to break them down.
City are keeping this spell of pressure up, but Watford have all their players back in their own half and behind the ball.
So far, so good for Watford.
City are finding a few cracks in the Hornets defence, though. Bacary Sagna brings a low save from Heurelho Gomes when a corner is not cleared and, soon after, Raheem Sterling brings another good stop from the keeper... with his low shot squeezing under the Brazilian who got just about enough on it to turn it the wrong side of the post. The ball trundled a couple of inches wide.