Brighton & Hove Albion lost for the first time in seven games after falling to a 1-0 defeat to David Moyes' Everton.
Iliman Ndiaye's penalty split the teams at the break after the referee had given a controversial handball against Dutch defender Joel Veltman just before half-time.
Despite the pressure in the second half, Brighton struggled to create many clear-cut chances, with Fabian Hurzeler's team failing to push on in the hunt for European football.
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Story of the Match
Both teams kept the same line-ups from their victories the week before against Manchester United and Tottenham.
Brighton created the game's first opening as Tariq Lamptey got past Jake O'Brien in a dangerous area, but his cross could not find a teammate.
Everton striker Dominic Calvert-Lewin was replaced 13 minutes in after picking up an injury to his hamstring.
His replacement, Beto, almost got on to the end of a ball in the box, before confusion between Seagulls goalkeeper Bart Verbruggen and Carlos Baleba resulted in a corner to the away team.
Brighton kept the pressure on the Toffees, but struggled to create many good chances in the opening 30 minutes.
Just before half-time, Veltman was deemed to have handballed it in the box after holding off Beto, with referee Tim Robinson pointing to the spot after a lengthy VAR check.
Despite the chorus of boos and the long wait, Ndiaye made no error with his spot kick, placing the ball just out of reach for Verbruggen, and celebrated by waving his arms up and down, imitating a seagull in front of the home fans.
The hosts could not reply before the break, with their best chance coming from a long-range effort from Baleba which was dragged wide.
As the half-time whistle blew, boos rang around the stadium aimed at the referee after the controversial handball decision.
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Comeback attempts
Brighton had come out of the blocks the quickest in the second half, with Veltman having a shot from the edge of the box which almost went out for a throw, before Karou Mitoma came close with a curling effort which just went past Jordan Pickford's post.
The Seagulls kept creating chances, with Joao Pedro's deflected effort hitting the top of Pickford's crossbar and Baleba's well-hit effort from the resulting corner well blocked.
Subsitiute Georginio Rutter did well to retrieve the ball on the edge of the box, but his powerful volley went wide of his target.
Everton used this lead in the second half to their advantage, as they took their time over anything they could, which backfired when Pickford was yellow carded, which was met by cheers from the home fans.
As well as that, they were pushed back in their half for a lot of the second period, but Beto won the ball back in Brighton's half before driving into the penalty area where his shot smashed against the side netting.
With little time left, Brighton were desparate for a leveller and had a chance through Danny Welbeck, whose deflected shot did not trouble Pickford, with eight minutes added shortly after.
Despite Everton being down to 10 men due to Orel Mangala getting injured, Brighton could not break down the stubborn Toffees defence, with this result leaving them in ninth, with Everton just one point behind Tottenham in 16th, seven points clear of the drop zone.
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Player of the Match - Jarrad Branthwaite
The defender played a key part in their win today, with the England international making 13 clearances and not being dribbled past in a very solid performance.
