West Ham's Emerson scored an own goal in the 20th minute, then Mateta netted his first of two in the 31st for a 4-0 lead.
Michail Antonio pulled one back in the 40th minute before Mateta bagged his second in the 64th. Palace keeper Dean Henderson gifted West Ham an 89th-minute goal when he mishandled a pass back from defender Tyrick Mitchell.
Published 21 April 2024, 16:45 IST