The Swans ended a seven-game winless run by defeating the Baggies 1-0 thanks to an early goal from Ki Sung-yueng.
The South Korean midfielder was on hand to poke home from pointblank range as Boaz Myhill failed to hang onto Angel Rangel's initial effort in just the ninth minute of the contest.
The victory saw Alan Curtis' Swans move up to 16th place on the table as Tony Pulis' Albion, who have failed to win in five games, remained in 13th.
- A much-needed win for Swansea who moved out of the relegation zone. Do they have the quality to avoid the drop under interim boss Curtis?
- Albion struggling at the minute. They definitely needs more goals. Is it time for Pulis to start giving more minutes to Berahino?
Huge 3 points today. Ugly win but very important. Fans were excellent today. Keep the faith!! #swans#confidencepic.twitter.com/GDYIxWfBhH
— Angel Rangel (@arangelz) December 26, 2015
Happy for the win against WBA.Was 3 importants points.now focus to the next game
— Bafétimbi Gomis (@BafGomis) December 27, 2015
West Brom boss Pulis on his side's misfortune:
"The big disappointment is I've just watched the video there and it's two penalties,.
"The first foul on Chris Brunt is a stonewall banker penalty. Their lad goes for the ball but Chris just touches it away and catches him."
Swansea's Curtis on the improvement of his team:
"We can play better and we have played better in the last couple of games.
"We were under the cosh and it wasn't pretty, it was a bit un-Swansea-like but we showed enough to get over the line."
*Thanks to Opta
2 - Two of the 12 Premier League goals that Ki Sung-yueng has scored have come on Boxing Day. Festive.
— OptaJoe (@OptaJoe) December 26, 2015