West Brom surrendered their place in the FA Cup with a whimper as Dwight Gayle’s first-half goal and Marouane Chamakh’s late strike took Crystal Palace into round four.
A much-changed Albion side put in a dismal display against their fellow Premier League strugglers with Gayle’s scruffy goal settling the tie before Chamakh scored with the final touch of the game.
Albion had chances after the interval but there were precious few signs of urgency from the hosts.
Albion had the first chance after a low-key opening period when Zoltan Gera’s cross found Saido Berahino on the edge of the area but he sent a difficult volley well over the bar.
But it was Palace who went closer moments later after Yannick Bolasie powered away from makeshift full-back Craig Dawson on the Baggies right.
His cross found Barry Bannan, who exchanged passes with Dwight Gayle before striking a shot against the post.
Albion had another opening on 15 minutes when a clever ball from Zoltan Gera fed Matej Vydra, who fired straight at keeper Julian Speroni.
But the visitors went ahead on 23 minutes courtesy of some poor Baggies defending.
Goran Popov’s poor pass was picked up by Hiram Boateng and, when he was allowed time to pick out a pass, he found Gayle.
The striker’s shot from the edge of the box wrong-footed Ben Foster and crept into the bottom corner.
Almost immediate Albion won a corner and when Gera’s second cross found Dawson, the defender sent a header just over the bar.
But the game then went into a rut before half-time with the Baggies unable to find any cohesion.
Just before half-time Vydra did well to control a high ball on the Albion left but his snap-shot was held comfortably by Speroni.
Berahino tried his luck from distance on two occasions early in the second half with the first effort saved comfortably by Speroni before the second was parried by the goalkeeper agonisingly behind the onrushing Shane Long.
And the Baggies had another opportunity when Long’s header fell for Vydra on the edge of the Palace area but his shot was saved superbly by Speroni, diving low to his left.
Downing made three changes in a bid to turn the game around but the Baggies could only manage long-range efforts which did not test Speroni.
In stoppage time, Gera let fly with a volley from inside the box but his effort was deflected agonisingly wide.
But Chamakh added the second with the final kick of the game, blasting into an empty net after Gayle cut in from the left.