A devastating first half performance from Swansea City earned them all three points against a disappointing West Brom at the Liberty Stadium.
The visitors went into the game riding high on confidence, sitting 3rd in the league, after their best start to a season in nearly 50 years.
Although Swansea City started with real purpose and went ahead within 9 minutes.
Michu scored his 8th Premier League goal of the season after great work by Hernandez, the Spanish international firing in a low cross to allow his fellow countryman a simple tap in from 6 yards.
2 minutes later the Swans doubled their lead. Hernandez again the provider as Routledge found himself in the right place at the right time to bundle in after a blocked clearance.
Swansea City were full of confidence at this point and a third soon followed.
Routledge scored his second of the night on 40 minutes after great build up play from Nathan Dyer. The ball found it's way to Routledge, 10 yards out, and the winger had time and space to smash a low shot under the body of Boaz Myhill in the visitors goal.
Michael laudrup would have been delighted with the way his side were tearing West Brom apart, although he wouldnt have been happy with the way his side defended with seconds left in the half.
Romelu Lukaku reacted quickest after the ball broke in the box from a corner and the Baggies striker was left with the simplest of finishes to pull a goal back and give the away side a foothold in the game going into the break.
West Brom flooded forward in the second half, enjoying more possession, although were unable to create any clear cut chances.
In fact Swansea could have scored a fourth, Michu heading just wide from an Angel Rangel cross, while Ki's free kick from 30 yards out just crept the wrong side of the post with Myhill beaten.
Swansea City's crisp passing ensured they comfortably saw out the game to claim a win which moves them up to 8th in the table, just 6 points behind West Brom who occupy the final Champions League place in 4th.