The 26-year-old struck his second goal of the campaign after just two minutes, while Wayne Routledge netted a sublime effort to put Swansea two ahead by half-time.
|By Tom Davis
West Brom were comfortably put out of their misery by Swansea City.
They have never won a Premier League game in August but, after just 87 seconds, the writing was on the wall for them again today.
Nathan Dyer’s double was well-earned for a winger who is surely as deserving as anyone to force his way into Roy Hodgson’s England squad.
Gylfi Sigurdsson provided assists for both of Dyer’s goals, while Wayne Routledge’s sublime strike is an early contender for goal of the season.
It’s a game Alan Irvine will want to forget but West still face problems on the road – just as they did last season.
Dyer latched on to Gylfi Sigurdsson’s smart flick-on to net his second of the game with 19 minutes remaining and Garry Monk’s men now sit at the top of the Premier League having recorded three consecutive victories.
Monk spoke in the build-up about turning the Liberty Stadium into a "fortress" and there was certainly no warm welcome for West Brom.
Dyer, who scored the goal that settled last weekend's 1-0 win over Burnley, forced his way through the visitors' defence to get on the end of Sigurdsson’s backheel and put the ball in the net from a tight angle, with Jonas Olsson's slip in the box proving costly.
Wilfried Bony fired over as Swansea looked to extend their advantage, but it was a sensational improvised effort from Routledge that eventually put the hosts two up.
Sigurdsson's cross was headed by Craig Dawson to the edge of the penalty area, where Routledge managed to shape his body perfectly to get over the ball and fire a spectacular half-volley beyond Ben Foster.
It could have been three on the half-hour mark when Olsson headed against his own crossbar, before full debutant Brown Ideye's tame effort brought a simple first save of the game out of Lukasz Fabianski.
West Brom announced the signing of winger Sebastian Blanco from Metalist 30 minutes before kick-off, and Alan Irvine's men looked in need of a creative spark, despite wrestling back some possession after the interval.
Andre Wisdom was lucky to escape punishment when he appeared to block a Bony shot with his arm on the goal line.
The chance came after Dawson had been penalised for a lesser-spotted back pass – a bold, but correct, call by referee Paul Tierney on his Premier League bow.
Bony should have done better in the 69th minute when he sent the ball narrowly over the crossbar after being set up by substitute Jefferson Montero.
But the result was put beyond doubt two minutes later as Sigurdsson sent Dyer clean through on goal and the winger made no mistake in slotting the ball past Foster.
Dyer's second ended the match as a contest, but Fabianski had to be alert to deny James Morrison with a diving save before time was up.