Sunderland somehow came in at half-time with the game still goalless despite persistent pressure from the hosts, but the floodgates proceeded to open just before the hour mark as Michael Laudrup’s side assumed total control.
Phil Bardsley suffered the ignominy of netting the first after Jonathan De Guzman’s corner rebounded off his back and past Keiren Westwood, before the Swansea midfielder produced a touch of class with a stunning strike seconds later to double his side’s advantage.
Wilfried Bony added a third from the penalty spot after Leon Britton had won a penalty at the expense of Craig Gardner, before defender Chico Flores pounced from close range to turn a De Guzman corner beyond Westwood to round off an emphatic victory.
It was a chastening defeat for Poyet’s side in his first match in charge and one that leaves the Black Cats rock bottom of the Premier League with still just a single point on the board after eight games of the season.
57’ – GOAL: De Guzman whips over a corner from the right and the ball rebounds off Bardsley's back and beyond a helpless Westwood into the back of the Sunderland net. Swansea deserve a breakthrough goal, but that was a very unfortunate intervention from Bardsley.
58’ – GOAL: De Guzman turns goalscorer as he receives a pass from Routledge and bends a glorious finish into the top corner of the net. Westwood has no chance whatsoever and De Guzman produces a touch of class that doubles Swansea's lead, two minutes after the opening goal.
63’ – PENALTY: Gardner makes a very clumsy challenge as he trips Britton who races into the box from the left flank and wins a penalty for his side with a pacey run that takes Sunderland completely by surprise. Bony coolly steps up and passes the ball into the left corner of the net with Westwood unable to get near it, and Swansea have scored three goals in eight minutes. It's all gone disastrously wrong for Sunderland and they have it all to do now. Swansea are cruising.
80’ - GOAL: Flores adds a fourth for Swansea from another De Guzman corner as the hosts continue their dominance in this match and put woeful Sunderland to the sword. Laudrup can afford a smile now as the defender pounces from close range to add another. Poyet must be desperate for this match to end.
Gus Poyet became the 11th different manager to take charge of a Sunderland match in the Premier League (12, if you include both spells by Kevin Ball).
Swansea came into the match with 99 Premier League goals to the club's name – they now have 103.
Swansea had gone eight successive home games without a win in the Premier League, the longest current run, before ending that sequence.
TALKING POINT: Where does Poyet go from here? It was a disastrous start to his reign at Sunderland with the Black Cats convincingly beaten. Poyet promised that he would deliver a 'crash course' in how to play football his way, but his changes have not worked so far. It could hardly have been a worse start for him in charge of Sunderland.
MAN OF THE MATCH
Jonathan de Guzman (Swansea City): A stunning curled finish from the midfielder doubled Swansea's lead before the hour mark to top off two assists from corners as he played a huge part in everything positive from the hosts in an emphatic victory.
Swansea City: Vorm 6, Rangel 7, Chico 7, Amat 7, Davies 6, Britton 7, De Guzman 8, Michu 7, Dyer 7, Routledge 7, Bony 7. Subs: Taylor 6, Pozuelo 6, Vazquez 6.
Sunderland: Westwood 6, Celustka 5, Bardsley 5, O'Shea 6, Roberge 5, Cattermole 6, Johnson 5, Larsson 5, Gardner 5, Giaccherini 5, Fletcher 5. Subs: Colback 5, Altidore 5, Borini 5.
THE MATCH IN A TWEET