Match ends, Swansea City 1, West Bromwich Albion 2.
Youssouf Mulumbu scored a late winner as West Bromwich Albion came from behind to beat Premier League relegation rivals Swansea.
The Swans dominated the first half and went ahead early on thanks to Roland Lamah's solo effort.
Stephane Sessegnon's 25-yard strike brought a resurgent West Brom level after the break.
Mulumbu then shot in off the post with five minutes left to give Pepe Mel his first win as Baggies manager.
The result moves West Brom to 16th, three points clear of the relegation zone and within one point of 14th-placed Swansea.
The hosts started brightly at a sun-drenched Liberty Stadium and took the lead after only two minutes.
Swans striker Wilfried Bony slid the ball through to Lamah out wide, who raced clear down the Albion right flank.
The 26-year-old skipped past Baggies full-back Stephen Reid inside the area, before curling the ball into the corner of the net from the edge of the six-yard box.
West Brom's only effort of note came when Victor Anichebe hit a shot straight at Swans keeper Michel Vorm.
Swansea looked comfortable in possession and regularly released their wide men down the wings as they attempted to get in behind the Baggies' back five.
Routledge and Lamah whipped in low crosses at every opportunity as Mel's side found it difficult to get into the game and Albion were lucky not to fall further behind before half-time.
Bony connected with Lamah's low curling cross just six yards out but could only direct it straight at Baggies keeper Ben Foster, and captain Ashley Williams saw his downward header bounce narrowly over the bar.
After the break West Brom pressed higher up the pitch and showed more attacking intent, and it was not long before their more positive approach paid off.
James Morrison laid the ball to Sessegnon outside the Swansea area and the 29-year-old curled a powerful low drive into the bottom corner.
Swansea almost hit back straight away through a Jonathan de Guzman free-kick which forced a diving save out of Foster.
But the Baggies continued to press and with the game heading for a draw, the ball broke to Mulumbu on the edge of the Swansea area.
And the Congolese midfielder passed the ball in off the post to give the Baggies their second away win of the season.
West Brom boss Pepe Mel:
"The players need to win and now it's different, I hope. [At half-time] we talked about the problems, talked about the football, talked about the future face to face, and it's only 45 minutes and we need to change. The football players at West Brom are intelligent.
"The pressure is the same for all the countries - in Spain, in England, Germany it's the same. My work is dangerous. Head coach is a difficult job, but the most important in football is the player."
Swansea boss Garry Monk:
"Second half for some reason we just switched off. We were sloppy. Sloppy in our passing, touches on the ball.
"We were poor and I think that just invited West Brom onto us. The second goal is always crucial in a game like that and unfortunately West Brom got it."
- 7BrittonSubstituted forEmnesat 87'minutes
- 15RoutledgeBooked at 29mins
- 21Cañas Ruiz HerreraSubstituted forPérez Cuestaat 63'minutes
- 20De Guzmán
- 14LamahSubstituted forHernándezat 77'minutes
- 9Pérez Cuesta
- 2ReidBooked at 42mins
- 3OlssonBooked at 53mins
- 17DorransSubstituted forGeraat 75'minutes
- 16AnichebeBooked at 26minsSubstituted forO'Neilat 89'minutes
- 29SessegnonSubstituted forBifouma Koulossaat 79'minutes
- 50Bifouma Koulossa
- Martin Atkinson
- Shots on Target
Second Half ends, Swansea City 1, West Bromwich Albion 2.
Foul by Michu (Swansea City).
Jonas Olsson (West Bromwich Albion) wins a free kick in the defensive half.
Offside, Swansea City. Pablo Hernández tries a through ball, but Marvin Emnes is caught offside.
Corner, Swansea City. Conceded by Jonas Olsson.
Substitution, West Bromwich Albion. Liam O'Neil replaces Victor Anichebe.
Substitution, Swansea City. Marvin Emnes replaces Leon Britton.
Offside, Swansea City. Jonathan De Guzmán tries a through ball, but Wilfried Bony is caught offside.
Goal! Swansea City 1, West Bromwich Albion 2. Youssuf Mulumbu (West Bromwich Albion) right footed shot from outside the box to the bottom right corner.
Pablo Hernández (Swansea City) wins a free kick in the attacking half.
Foul by Youssuf Mulumbu (West Bromwich Albion).
Attempt blocked. Wilfried Bony (Swansea City) right footed shot from the centre of the box is blocked. Assisted by Angel Rangel with a cross.
Foul by Angel Rangel (Swansea City).
James Morrison (West Bromwich Albion) wins a free kick in the attacking half.
Attempt missed. Jordi Amat (Swansea City) right footed shot from more than 35 yards is high and wide to the left. Assisted by Pablo Hernández.
Jonathan De Guzmán (Swansea City) wins a free kick in the defensive half.
Foul by Thievy (West Bromwich Albion).
Substitution, West Bromwich Albion. Thievy replaces Stéphane Sessegnon.
Substitution, Swansea City. Pablo Hernández replaces Roland Lamah because of an injury.