Match ends, Sunderland 1, Manchester City 4.
Manchester City swept aside Sunderland in the League Cup third round to add to Black Cats boss Dick Advocaat's woes.
Sergio Aguero opened the scoring from the penalty spot after Patrick van Aanholt fouled Jesus Navas.
Kevin de Bruyne shot past Vito Mannone, who then scored an unwitting own goal when Raheem Sterling's shot hit the post, struck him and went in.
Sterling completed the first-half rout from De Bruyne's cross, before Ola Toivonen netted a late consolation.
This was a fifth defeat in eight matches for Sunderland, who are bottom of the Premier League before their trip to Manchester United on Saturday.
By contrast, City rebounded impressively from their first defeat of the season against West Ham on Saturday.
Record signing De Bruyne was once again influential on only his second start for the club.
For Sunderland, the sole bright spot was the performance of debutant full-back DeAndre Yedlin, who supplied the cross for Toivonen's goal.
Sunderland manager Dick Advocaat:
"Maybe you think I am negative, but the way we played in the first 25 minutes was very positive.
"I was not really happy with the way that we again gave the goals away, and it's not the first time, but there's no sense in calling names because everybody could see the mistakes, simple mistakes and it's not possible to make those mistakes at this level, especially not against a team like that.
"The quality from the other side was too much."
Manchester City boss Manuel Pellegrini:
"It was important to win the way we did today because we have just come from two important defeats, one in the Champions League and the other in the Premier League, so it was important to start this Capital One Cup in the way that we did in the first half.
"It's important to win. Maybe we didn't deserve to lose the two games that we lost, but we did, so it was important not to continue in that sense."
- 22CoatesBooked at 45mins
- 3van Aanholt
- 8RodwellBooked at 15minsSubstituted forCattermoleat 45'minutes
- 14Gomez Garcia-Penche
- 26DemichelisBooked at 57mins
- 42Y TouréSubstituted forEvansat 89'minutes
- 15NavasSubstituted forRobertsat 55'minutes
- 17De Bruyne
- 10AgüeroSubstituted forGarcia Alonsoat 74'minutes
- 76Garcia Alonso
- Roger East
- Shots on Target
Second Half ends, Sunderland 1, Manchester City 4.
Attempt missed. Fabio Borini (Sunderland) right footed shot from outside the box misses to the right. Assisted by Lee Cattermole.
Substitution, Manchester City. George Evans replaces Yaya Touré.
Foul by Patrick Roberts (Manchester City).
Ola Toivonen (Sunderland) wins a free kick in the defensive half.
Corner, Manchester City. Conceded by John O'Shea.
Patrick Roberts (Manchester City) wins a free kick in the defensive half.
Foul by Patrick van Aanholt (Sunderland).
Delay over. They are ready to continue.
Delay in match (Manchester City).
Goal! Sunderland 1, Manchester City 4. Ola Toivonen (Sunderland) header from the right side of the six yard box to the bottom right corner. Assisted by DeAndre Yedlin with a cross.
Foul by Fernando (Manchester City).
Yann M'Vila (Sunderland) wins a free kick in the defensive half.
Offside, Sunderland. Adam Johnson tries a through ball, but Jeremain Lens is caught offside.
Offside, Sunderland. Patrick van Aanholt tries a through ball, but Adam Johnson is caught offside.
Substitution, Manchester City. Manu García replaces Sergio Agüero.
Corner, Sunderland. Conceded by Aleksandar Kolarov.
Attempt saved. Fabio Borini (Sunderland) right footed shot from the right side of the box is saved in the centre of the goal. Assisted by DeAndre Yedlin with a through ball.
Foul by Martín Demichelis (Manchester City).