Sergio Aguero smashed two goals in a sensational Manchester City debut to give Swansea a red-hot welcome to the Premier League.
The battling Swans held out until half time thanks to keeper Vorm, but goals from Edin Dzeko, Aguero, David Silva and Aguero again underlined just how tough it will be at the top level.
Sub Aguero's goals got a special cheer from the home crowd, who saw him form a partnership with Silva which threatens big trouble for opposing defences this season.
Manchester City, parading talent worth £154million, left controversial striker Mario Balotelli out of their starting line-up against the Swans, whose squad cost £7.3m.
The former Inter Milan forward had to make do with a place on the bench alongside £38m record signing Aguero and fellow new recruit Stefan Savic.
Swansea fielded their record signing Danny Graham, who cost a mere £3.5m.
After the match, Manchester City boss Roberto Mancini warned Premier League rivals: You ain't seen nothing yet!
The £35million striker came off the bench after Edin Dzeko's opener to tap home No 2, brilliantly set up David Silva for the third then crack in a 30-yard humdinger.
Mancini said: "He needs another two or three weeks to be 100 per cent.
"He has worked only one week with the team and he needs to improve. He has to recover from the Copa America three weeks ago.
"He's a fantastic striker, he's young and he will be a fantastic player for us in the future.
"He linked very well with David Silva - they play in the same language.
"I'm delighted after this performance.
"I thought in the first half Swansea played very well.
"But after 25 minutes we started to press and had many chances to score.
"It is only the first match - the season will be long.
"But it was very important for us to start like this."
After the match, Aguero took to Twitter to express his delight at his performance.
He said: "Very happy with my debut for City. Hopefully the start of something big. Thank you to my team-mates and the fans for their support."
And his team-mates were cock-a-hoop at the 23-year-old's dream debut.
City goalkeeper Joe Hart said: "He's decent isn't he?
"He came with a big price tag, but it's money well spent."
And skipper Vincent Kompany added: "He has definitely come as a surprise.
"He has great potential and the most important thing for me is that you saw some moments of him defending and working hard.
"For us, for the team this season, that's important."
Swansea manager Brendan Rodgers was far from dismayed despite the scoreline.
He said: "I'm very proud of my team because up until the hour mark we were fantastic, had good possession and we looked like we could create something.
"But we conceded two quick goals and after that it was very difficult.
"There's a fantastic spirit in the group. It wasn't an ideal result but we'll take many positives from it.
"We won't be downhearted. We will continue to play the way we play and we know we won't come up against this quality of opposition every week."
The battling Swans held out until half time thanks to keeper Vorm, but goals from Edin Dzeko, Aguero, David Silva and Aguero again underlined just how tough it will be at the top level.
Sub Aguero's goals got a special cheer from the home crowd, who saw him form a partnership with Silva which threatens big trouble for opposing defences this season.
Manchester City, parading talent worth £154million, left controversial striker Mario Balotelli out of their starting line-up against the Swans, whose squad cost £7.3m.
The former Inter Milan forward had to make do with a place on the bench alongside £38m record signing Aguero and fellow new recruit Stefan Savic.
Swansea fielded their record signing Danny Graham, who cost a mere £3.5m.
After the match, Manchester City boss Roberto Mancini warned Premier League rivals: You ain't seen nothing yet!
The £35million striker came off the bench after Edin Dzeko's opener to tap home No 2, brilliantly set up David Silva for the third then crack in a 30-yard humdinger.
Mancini said: "He needs another two or three weeks to be 100 per cent.
"He has worked only one week with the team and he needs to improve. He has to recover from the Copa America three weeks ago.
"He's a fantastic striker, he's young and he will be a fantastic player for us in the future.
"He linked very well with David Silva - they play in the same language.
"I'm delighted after this performance.
"I thought in the first half Swansea played very well.
"But after 25 minutes we started to press and had many chances to score.
"It is only the first match - the season will be long.
"But it was very important for us to start like this."
After the match, Aguero took to Twitter to express his delight at his performance.
He said: "Very happy with my debut for City. Hopefully the start of something big. Thank you to my team-mates and the fans for their support."
And his team-mates were cock-a-hoop at the 23-year-old's dream debut.
City goalkeeper Joe Hart said: "He's decent isn't he?
"He came with a big price tag, but it's money well spent."
And skipper Vincent Kompany added: "He has definitely come as a surprise.
"He has great potential and the most important thing for me is that you saw some moments of him defending and working hard.
"For us, for the team this season, that's important."
Swansea manager Brendan Rodgers was far from dismayed despite the scoreline.
He said: "I'm very proud of my team because up until the hour mark we were fantastic, had good possession and we looked like we could create something.
"But we conceded two quick goals and after that it was very difficult.
"There's a fantastic spirit in the group. It wasn't an ideal result but we'll take many positives from it.
"We won't be downhearted. We will continue to play the way we play and we know we won't come up against this quality of opposition every week."
