Match ends, Cardiff City 0, Manchester City 5.
Manchester City strolled to an emphatic win at Cardiff City as they moved up to second in the Premier League table.
The stylish visitors were out of sight by half-time, leading 3-0 thanks to Sergio Aguero's sweeping finish, a clever looping header from Bernardo Silva and Ilkay Gundogan's delightful curling effort.
City underlined their superiority after the break with a brilliant fourth as a patient, incisive team move teed up Riyad Mahrez to tap in his first goal for the club, before the Algerian whipped in his second late on.
Cardiff simply could not live with an irresistible City side and, as they are still searching for their first win this season, the Bluebirds now find themselves second from bottom of the table.
For Pep Guardiola's men, however, this was an instant and convincing riposte following Wednesday's shock defeat at home to Lyon in the Champions League.
That loss was made to look like an aberration by this performance, even if it was against a newly promoted Cardiff side who look ill equipped to cope with the Premier League's leading teams.
City asserted their dominance from the first minute and, once Aguero had opened the scoring in his 300th appearance for the club after half an hour, this match became a procession.
Guardiola's players passed and moved with grace and speed, leaving their opponents bewildered.
Cardiff, a physically imposing side, will have been disappointed to allow one of the shortest players on the pitch, Bernardo Silva, to score the second with his head - but it was still a goal to marvel at, as the Portuguese arced his neck to generate the dip required to loop the ball backwards over goalkeeper Neil Etheridge.
There was even more to admire in the third goal, as Gundogan neatly exchanged passes with Leroy Sane and Raheem Sterling before stroking the ball into the top corner.
Gundogan then turned provider for the fourth - and arguably the best - goal of the afternoon, with a sustained period of City possession freeing the Germany midfielder to square the ball for Mahrez to convert from close range.
Tempers had flared when these two sides met here in the FA Cup in January, when Cardiff's Joe Bennett was sent off.
City thoroughly outclassed their opponents - then in the Championship - to win 2-0 on that occasion, and the gulf in quality appeared even greater this time.
Cardiff initially battled as enthusiastically as one would expect from a team managed by Neil Warnock. But as soon as they conceded the opening goal, a thrashing seemed inevitable.
While the Bluebirds may not have expected much from a fixture against the reigning champions, it will concern Warnock that his side have now conceded 12 goals in their past three games.
After matches against City, Chelsea and Arsenal, Cardiff will be relieved to welcome Burnley to south Wales next weekend.
Cardiff City's next fixture sees them take on Burnley in the Premier League at home on Sunday, 30 September (16:00 BST).
Meanwhile, Manchester City travel to Oxford United in the EFL Cup on Tuesday, 25 September (19:45), before welcoming Brighton in the Premier League on Saturday, 29 September (15:00).
Match ends, Cardiff City 0, Manchester City 5.
Second Half ends, Cardiff City 0, Manchester City 5.
Corner, Manchester City. Conceded by Harry Arter.
Goal! Cardiff City 0, Manchester City 5. Riyad Mahrez (Manchester City) left footed shot from the centre of the box to the bottom left corner.
Attempt blocked. Raheem Sterling (Manchester City) right footed shot from the centre of the box is blocked. Assisted by Riyad Mahrez with a headed pass.
Attempt saved. Phil Foden (Manchester City) left footed shot from the centre of the box is saved in the centre of the goal. Assisted by Bernardo Silva.
Offside, Cardiff City. Víctor Camarasa tries a through ball, but Bobby Reid is caught offside.
Attempt saved. Riyad Mahrez (Manchester City) right footed shot from a difficult angle on the right is saved in the bottom right corner. Assisted by Fabian Delph with a cross.
Corner, Manchester City. Conceded by Neil Etheridge.
Attempt saved. Raheem Sterling (Manchester City) right footed shot from outside the box is saved in the top centre of the goal.
Raheem Sterling (Manchester City) wins a free kick in the attacking half.
Foul by Sean Morrison (Cardiff City).
Offside, Cardiff City. Kenneth Zohore tries a through ball, but Josh Murphy is caught offside.
Substitution, Cardiff City. Josh Murphy replaces David Junior Hoilett.
Substitution, Manchester City. John Stones replaces Fernandinho.
Corner, Manchester City. Conceded by Joe Ralls.
Attempt blocked. Bernardo Silva (Manchester City) left footed shot from the centre of the box is blocked. Assisted by Phil Foden.
Offside, Manchester City. Kyle Walker tries a through ball, but Raheem Sterling is caught offside.
Substitution, Manchester City. Phil Foden replaces Ilkay Gündogan.
Nicolás Otamendi (Manchester City) wins a free kick in the defensive half.
Foul by Kenneth Zohore (Cardiff City).
Goal! Cardiff City 0, Manchester City 4. Riyad Mahrez (Manchester City) left footed shot from the centre of the box to the centre of the goal. Assisted by Ilkay Gündogan.
Substitution, Cardiff City. Kenneth Zohore replaces Danny Ward.
Substitution, Manchester City. Riyad Mahrez replaces Sergio Agüero.
Fernandinho (Manchester City) is shown the yellow card for a bad foul.
Foul by Fernandinho (Manchester City).
David Junior Hoilett (Cardiff City) wins a free kick in the attacking half.
Leroy Sané (Manchester City) hits the left post with a header from the centre of the box. Assisted by Ilkay Gündogan with a cross following a set piece situation.
Leroy Sané (Manchester City) wins a free kick on the right wing.
Foul by Greg Cunningham (Cardiff City).
Attempt missed. Leroy Sané (Manchester City) left footed shot from the right side of the six yard box misses to the left following a corner.
Attempt saved. Sergio Agüero (Manchester City) right footed shot from the centre of the box is saved in the bottom right corner.
Attempt blocked. Aymeric Laporte (Manchester City) header from the centre of the box is blocked. Assisted by Bernardo Silva with a cross.
Corner, Manchester City. Conceded by Sean Morrison.
Attempt blocked. Sergio Agüero (Manchester City) right footed shot from the centre of the box is blocked. Assisted by Raheem Sterling.
Attempt saved. Bobby Reid (Cardiff City) right footed shot from the centre of the box is saved in the centre of the goal. Assisted by Sean Morrison with a headed pass.
Foul by Fernandinho (Manchester City).
Danny Ward (Cardiff City) wins a free kick on the right wing.
Substitution, Cardiff City. Jazz Richards replaces Lee Peltier because of an injury.
Delay over. They are ready to continue.