A first half Romelu Lukaku strike and a second half own goal from the Swans' Dutchman earned the home side only its third win of 2013 to keep its Europa League hopes alive
Twenty years ago, the two sides were battling it out for promotion from the old Division Two. Today, both are well-established top flight sides, and from their performances today at the Hawthorns, it was clear to see why both West Brom and Swansea currently find themselves firmly rooted in the top half of the table.
Early pressure from Swansea paid off after 33 minutes when Luke Moore headed his side into the lead, but the hosts immediately sprung into life and Lukaku equalized just before half time after a swift Baggies counterattack.
Lukaku missed the opportunity to put his side ahead from the penalty spot after 56 minutes, but De Guzman was on hand to accidentally put the ball in to the back of his own net five minutes later to wrap up all three points for West Brom.
Swansea's constant pressure finally paid off after 33 minutes when Moore headed his side into the lead, the former West Brom player escaping Jonas Olsson in the West Brom defense to divert De Guzman's corner into the back of the net for his second goal in as many games.
Despite being second best for the vast majority of the first half, the Baggies managed to find an equalizer seven minutes later through Lukaku, after a swift counterattacking movement down the right wing allowed Graham Dorrans to cross in for the Belgian teenager to poke past Swansea goalkeeper Michel Vorm.
Ten minutes into the second half, the youngster had the opportunity to put his side ahead from the penalty spot after Wayne Routledge was fouled on the edge of the area by James Morrison, but a poor spot kick from the Belgian was comfortably saved by Vorm in the Swansea goalmouth.
West Brom seemingly wasn't fazed by the miss, however, and it only took five minutes to go ahead when Angel Rangel cleared a Gareth McAuley headed effort off the line, only for his clearance to rebound off the back of De Guzman and into the corner of the net.
Swansea thought that it had rescued a point in the final minutes when Roland Lamah hit the back of the net with only three minutes left to play, but the linesman flagged for offside, much to the relief of West Brom, despite replays showing that the ball did not touch another Swans player in the build-up to the goal.