West Bromwich Albion recovered from the shock of conceding after only 12 seconds as they came from 2-0 down to claim a thrilling 3-2 victory over struggling Swansea City.

Swansea went ahead via the first attack of the game as Zan Vipotnik coolly lobbed West Brom keeper Josh Griffiths and they swiftly doubled the advantage thanks to Ethan Galbraith's fierce drive from outside the area.

Albion were booed off at the break after a woeful first-half display, but turned the contest on its head as in-form striker Aune Heggebo struck twice in the first seven minutes of the second period.

The hosts had all the momentum from that point on – and the winner eventually came when Jayson Molumby steered in from Josh Maja's lay-off.

Molumby's close-range finish condemned Swansea to a fifth successive defeat, with the Welsh club only outside the Championship's bottom three on goal difference having won just one of their past 10 league games.

New Swansea head coach Vitor Matos is without a point from his two matches in charge, but the outlook is brighter for Ryan Mason after the Baggies' rousing comeback.

Mason's team climb to 13th in the table having won for only the second time in their past eight matches.

Swansea's extraordinary opener came after Nat Phillips headed away Ben Cabango's punt upfield only for Goncalo Franco to cushion a pass into the Albion area, where Vipotnik applied a high-class finish.

Galbraith's second goal in as many games came despite the fact that Griffiths got hands to his long-range shot, but with that Swansea's attacking threat disappeared.

After Mason made no fewer than four half-time substitutions, his team immediately transformed the mood as Heggebo turned Cameron Burgess and fired between Lawrence Vigouroux's legs to reduce the deficit.

Swansea complained – in vain - that play should have been stopped because of a head injury to Franco, and there was much more pain to come for the visitors.

Heggebo quickly hooked in his second from close range after George Campbell nodded down Alex Mowatt's corner, before Molumby brought the house down at The Hawthorns by finding the bottom corner five minutes from the end.

Mason complained this week that West Brom were getting the "worst end" of the Championship fixture schedule.

The Albion boss bemoaned the fact that while his side played on Wednesday – when they drew with Birmingham – Swansea had faced Derby 24 hours earlier.

But there was no lack of energy on display as Mason's team stormed back into this contest having been left a little shellshocked by Swansea's opening spell.

The Swans had scored only four first-half goals in the league this season before this, and had not led a second-tier game at half-time.

Yet even at the break – and even against opponents with one of the poorest second-half records in the division this term - there was a feeling that Matos' freefalling team remained vulnerable.

So it proved, to leave West Brom suddenly looking up again and Swansea wondering where it has all gone wrong since they climbed to seventh in the table after victory at Sheffield Wednesday in late August.

West Brom head coach Ryan Mason:

"The whole second half was incredible - such a great reaction, so much personality first of all but a lot of quality in there as well.

"The first goal is incredible, then the second one normally doesn't go in but that's part of football, you have to respond.

"I thought we managed the period after that okay because I think rightly so there was a bit of negativity in the stadium. It was important to get through to half-time and try to give the lads some help.

"Second half we scored the early goal which helps, it brings a bit of belief and intensity in the stadium, and my feeling was it was a case of when, not if we were going to win the game."

Swansea head coach Vitor Matos:

"I think the right word maybe is frustration. I think we did a good first half.

"We were sharp, we showed desire, we showed hunger, we wanted to press and we wanted to control with the ball in a stadium where that is not easy to do. I think we were able to do that.

"We knew in the second half we needed to keep the same momentum and we were not able to. We started losing the duels, we started getting deeper and deeper and that gave the momentum to West Bromwich.

"We need to find the way that when these kind of games are happening, we need to find a way to close these games as much as we can."