Black Cats defeated in South Wales.
Four second-half Swansea goals saw Sunderland’s trip to South Wales end in defeat.
A quiet first period ended goalless in Gus Poyet’s first game in charge, but the hosts didn’t look back after they took the lead 12 minutes into the second half when Angel Rangel’s header found the net off Phil Bardsley.
Jonathan de Guzman made it 2-0 just a minute later before Wilfried Bony converted a 64th-minute penalty.
Chico Flores added a header - deflected in off Steven Fletcher - 10 minutes from time for the Swans, who picked up their first home league win of the campaign.
Poyet made three changes for his first game in charge, reintroducing Fletcher after the Scottish striker made a better than expected recovery from a shoulder problem.
Meanwhile Bardsley returned for his first appearance of the season while Seb Larsson stepped in for loanee Ki Sung-Yueng, ineligible against his former club.
With their new boss looking on, Sunderland started brightly and only a well-timed tackle from Flores prevented Gardner from going through on goal early on.
Fletcher almost made an early return to the scoresheet just before the quarter-hour, sweeping Adam Johnson’s low corner goalwards at the near post only to see the ball flash inches wide with Swansea keeper Michel Vorm well beaten.
The hosts grew into proceedings but didn’t threaten Keiren Westwood’s goal until just after the half-hour when de Guzman curled a well-struck free-kick just wide following Craig Gardner’s foul on Bony 25 yards out.
Encouraged, the Swans pressed for the remainder of the half but couldn’t turn their territorial advantage into chances, while at the other end Larsson tested Vorm with a whipped-in free-kick from the left.
Sunderland almost took the lead in the first moments of the second period, but an off-balance Bardsley fired over at the back post after Emmanuele Giaccherini managed to work the ball across goal.
But Swansea responded with three goals in eight minutes to pull away.
They took the lead in the 57th minute when a driven corner from the right was met by Rangel, whose header went in off Bardsley.
Midfielder de Guzman made it two a minute later, finding the top corner with a fine lofted shot from just outside the box which left Westwood with no chance.
The Sunderland keeper was in fine form to deny de Guzman moments later, pulling off a superb reaction save from close range.
But from the resulting short corner, Gardner’s foul on Leon Britton on the left-hand edge of the area gave Bony the chance to score from the penalty spot, which he duly did with a cool finish into the corner.
That treble saw the Swans build a cushion and Westwood was called into action to tip away a powerful header from Michu as the clock ticked into the last 10 minutes.
But City netted their fourth goal from the resulting corner – Flores stealing in to score with a header which took a big deflection off Fletcher on its way in.
- Yellow Flores Moreno
- Davies (Taylor)
- Routledge (Pozuelo Melero)
- De Guzmán
- Pérez Cuesta
- Bony (Vázquez García)
- Roberge Yellow
- Bardsley Yellow
- Johnson (Borini)
- Fletcher (Altidore)
- Giaccherini (Colback)
- Pozuelo Melero
- Cañas Ruiz Herrera
- Vázquez García