West Brom were looking to bounce back from a 4-1 loss to Liverpool last week by beating Crystal Palace at home on Saturday.
However, the visitors started brightly with Marouane Chamakh’s flick on falling for Adlene Guedioura who shot straight at Boaz Myhill.
Guedioura had to come off shortly after following a clash with the Baggies goalkeeper and West Brom made a forced change of their own in bringing on Saido Berahino for Billy Jones.
Guedioura's replacement - Jason Puncheon - dragged Palace’s best chance wide before Berahino scored his sixth goal of the season. The England Under-21 striker collected Stephane Sessegnon's ball just inside the Palace box before sweeping it round defender Dean Moxey and into the bottom corner.
A crucial touch from defender Joel Ward diverted Morgan Amalfitano's cross away from Shane Long before Sessegnon failed to make a clean connection as the defence parted invitingly in front of him.
Palace nearly punished West Brom for their wastefulness as Mile Jedinak headed wide when unchallenged eight yards from goal, before Chamakh sent the ball past an advancing Myhill but the inadvertent effort at goal was off target.
Seven minutes from time, Gareth McAuley barrelled in at the back post to settle the home fans' increasing nerves with a fine header. Palace finished strongly with Yannick Bolasie, Damien Delaney and Jerome Thomas all going close but it was too little, too late as their poor campaign continues.
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