Crystal Palace's furious first-half performance inspired them to a 5-2 thrashing of West Ham, whose top-six hopes suffered a blow on a miserable afternoon at Selhurst Park.
David Moyes' side produced a dreadful first-half display and were embarrassed in the opening 31 minutes, with Michael Olise and Eberechi Eze seemingly untouchable.
Olise opened the scoring after just seven minutes before Eze converted a rebound with an audacious bicycle kick. Emerson then summed up the Hammers' display by bundling the ball into his own net after a miscommunication with the beleaguered Lukasz Fabianski.
Jean-Philippe Mateta was left unmarked to slide in Palace's fourth. While Michail Antonio pulled one back before half-time, Mateta was able to fire in a fifth after more outstanding build-up play by Eze.
Even Dean Henderson's late error, allowing Tyrick Mitchell's pass to bobble into his own goal, won't take the shine off Palace's win - the first time they have claimed back-to-back Premier League victories in a year.
The heavy defeat completes a miserable week for West Ham, who exited the Europa League on Thursday and are now in danger of missing European qualification as their season threatens to peter out.
What's next?
Crystal Palace's next game is at home to Newcastle in the Premier League on Wednesday; kick-off 8pm. The Eagles then travel to Fulham on Saturday; kick-off 3pm.
West Ham are next in action at home to Liverpool in the Premier League on Saturday; kick-off 12.30pm. The Hammers then travel to Chelsea on Sunday May 5; kick-off 2pm.