West Brom paid for a dreadful performance as Nathan Dyer scored twice for Swansea City in a one-sided win.
The Baggies failed to fire in any department and were 2-0 down by half-time, as Dyer opened the scoring and Wayne Routledge added a second with a brilliant volley.
There was little improvement for the Baggies after half-time and more shocking defending allowed Dyer to complete the scoring on 71 minutes.
It leaves new Hawthorns head coach Alan Irvine with just two points to show for his first three Premier League games in charge.
Albion made the worst possible start as they found themselves a goal down with less than a minute and a half played.
When Dyer picked up possession on the edge of the area and exchanged passes with Gylfi Sigurdsson, Jonas Olsson appeared to have the return ball covered.
But when the Swede lost his footing Dyer nipped in ahead of Ben Foster to finish.
There was a bizarre moment early in the game when Baggies defender Jonas Olsson sprinted down the tunnel during play before returning to the field around a minute later.
After a low-key spell it got worse for Albion on 24 minutes when they fell 2-0 behind thanks to some shocking errors.
First Chris Brunt handed cheap possession to Gylfi Sigurdsson and then Craig Dawson failed to head the Icelander’s cross away from goal.
And that presented a chance to Routledge, who beat Foster with a fabulous volley from just outside the penalty area.
It could have been 3-0 just after the half-hour when Routledge crossed from the left and Olsson misjudged a header that looped over Foster and rebounded to safety off the crossbar, sparing the Swede an embarrassing own-goal.
As half-time approached the Baggies had a rare attempt on goal as Brown Ideye, making his full Premier League debut, turned away from two defenders and let fly from the edge of the box but Lukasz Fabianski made an easy save.
And moments later Ideye tried an ambitious lob from halfway that dipped well wide.
Late in the first half there was another near-miss for the hosts when Routledge sent a shot from a tricky angle high and wide.
Albion looked slightly improved in the second half but they could have been 3-0 down when Dyer got in behind their defence and narrowly failed to find the target.
The Baggies’ first chance did not come until after the hour-mark when Craig Dawson’s header from a Brunt corner was blocked and Fabianski saved the follow-up from Saido Berahino.
It was all over for the Baggies on 71 minutes when Swansea grabbed their third goal.
Sigurdsson’s flick found Dyer, who took advantage of a rash challenge by Olsson and some sleepy defending from Jason Davidson to race clear and slot a low effort past Foster.
Albion had a couple of efforts from long-range but Craig Gardner and half-time substitute Stephane Sessegnon both saw shots deflect harmlessly wide.
Fabianski made his first meaningful save with seven minutes remaining as he flew to his left to turn away a long-range drive from Baggies substitute James Morrison.
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