Watford have been relegated from the Premier League after Wilfried Zaha's first-half penalty secured a deserved victory for Crystal Palace at Selhurst Park.
Defeat by Burnley last week had left the Hornets 12 points adrift of safety with four games remaining and Palace sent their former manager Roy Hodgson's side straight back down to the Championship with a dominant display.
The Eagles controlled the contest from the outset and went ahead when Zaha confidently swept his 31st-minute spot-kick past Ben Foster after Hassan Kamara had used his arm to block Michael Olise's back-post header.
Watford never looked like scoring and their misery was compounded when Kamara, already booked for that handball, was dismissed when his push on Olise produced a second yellow card.