SUBSTITUTIONpublished at 70 mins
Chelsea 0-2 Man City
Riyad Mahrez's work is done. Warm applause for the City's record signing as he makes way for Gabriel Jesus. Time for another water break.
Aguero opened scoring with low 18-yard strike - 200th goal for City
Aguero added second from Bernardo Silva's pass
Chelsea keeper Caballero with several good saves
"Chelsea were outplayed" - 5 live pundit Dion Dublin
Neil Johnston
Chelsea 0-2 Man City
Riyad Mahrez's work is done. Warm applause for the City's record signing as he makes way for Gabriel Jesus. Time for another water break.
Chelsea 0-2 Man City
Chelsea's defence is in for a tough week on the training ground. It's being pulled all over the place and Riyah Mahrez is next to have a pop at goal. Wide.
Chelsea 0-2 Man City
That was goal number 201 for Aguero in a City shirt - 10 of those have come against Chelsea.
Chelsea 0-2 Man City
It's one game and the season has not even started for real - but I have to say City look on a different level to Chelsea.
Chelsea 0-2 Man City
This is running away from Chelsea.
Sarri has responded by making a double change. Willian and Danny Drinkwater provide the fresh legs - Hudson-Odoi and Fabregas make way.
Chelsea 0-2 Man City
Dion Dublin
Ex-Aston Villa striker on BBC Radio 5 live
Chelsea attacked there with numbers and, when they had the ball pinched by John Stones, those players that attacked just didn't quite get back - they looked shattered.
The Man City players on the break were lightning.
Chelsea 0-2 Man City
Matthew Upson
Former Arsenal defender
It's an excellent finish from that angle and Sergio Aguero is exactly where he needs to be.
Sergio Aguero
All over?
He's missed a couple of decent chances but Sergio Aguero produces a quality finish after Bernardo Silva's pass leaves David Luiz chasing shadows.
Augero thumps it low and hard past Willy Caballero and now he's on a hat-trick.
Chelsea 0-1 Man City
Big miss!
Chelsea 0-1 Man City
Another promising Chelsea move - and another wasted opportunity. Cesar Azpilicueta delivers a fine cross into the danger area but Alvaro Morata can't reach it and Callum Hudson-Odoi is too deep.
Chelsea 0-1 Man City
Matthew Upson
Former Arsenal defender
Chelsea have started with a bit more intent in the second-half but I don't think this system suits David Luiz playing in a back four. He is better in a three because it allows him to step out and showcase his skills.
Chelsea 0-1 Man City
H-U-G-E chance.
City should be 2-0 up after a delicious pass by Phil Foden sends Sergio Aguero racing clear. He rounds Willy Caballero but fires into the side-netting.
Chelsea were completely undone by Foden's pass.
Chelsea 0-1 Man City
Dion Dublin
Ex-Aston Villa striker on BBC Radio 5 live
Sergio Aguero was just trying to create an angle that David Luiz wouldn't allow. Very few centre-forwards can do what he does - you could see what he was trying to do - but it was really good defending from David Luiz who stayed patient.
Chelsea 0-1 Man City
Lively start. Sergio Aguero wastes a decent chance when he has better options before Alvaro Morata gets a sniff at the other end before he is dealt with by John Stones.
Chelsea 0-1 Man City
There is one change at the start of the second half and it's from City.
Leroy Sane picked up a knock in the first half and Pep Guardiola is not taking any risks so close to the start of his team's title defence.
It means Ilkay Gundogan is on - the German is sporting a protective face mask.
Chelsea 0-1 Man City
Maurizio Sarri is persevering with Alvaro Morata.
We're back under way at Wembley.
Chelsea 0-1 Man City
Chelsea need a goal. Their options on the bench include Victor Moses and Willian. Here come the teams...
Claudio Bravo...appearing in a comedy football bloopers DVD in time for Christmas.
Chelsea 0-1 Man City
Chris Bevan
BBC Sport at Wembley
I'd imagine both sets of players are glad to get back to the relative cool of their dressing rooms, and out of this intense heat. A gentle - very slight - breeze has just blown around the stadium but it is still ridiculously hot at Wembley.
At the moment this must be more like playing in a desert World Cup - think Qatar 2022 - than getting ready for the domestic English season.
Chelsea 0-1 Man City
Who has been your top pick and who has failed to deliver?
Sergio Aguero leads the way at the moment but that could quickly change.
Rate players out of 10 throughout the game. The rater will close 30 minutes after the final whistle.