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Tom Ince and Joe Ledley both scored on their debut for Crystal Palace at the weekend. Ince, who joined the side from Blackpool on loan, opened the scoring for the home side after 15 minutes and Ledley, previously of Celtic, extended Palace's lead 12 minutes later on a corner kick started by Ince.
Both players signed for Tony Pulis' side during the January transfer window.
After the break, West Brom pulled one back through substitute Thievy Bifouma, who was also making his debut for the side. After taking to the pitch, Thievy scored after just 36 seconds.
Marouane Chamakh sealed the win for the home side with a penalty in the 69th minute.