Brighton inflicted more misery on Arsenal as they moved into the Premier League’s top ten with a deserved victory at the Amex Stadium on Sunday.
Lewis Dunk and Glenn Murray scored inside the opening half an hour to put the Seagulls firmly in command.
Pierre-Emerick Aubameyang reduced the deficit on the stroke of half-time to give the Gunners hope but they were unable to breach Brighton’s back-line in the second half.
It continues a nightmare spell for the north London club and leaves Arsene Wenger under intense pressure.
Arsenal have lost four successive matches in all competitions and are sitting 13 points adrift of fourth-placed Tottenham in the league table.
It is a different story for Brighton and their boss Chris Hughton .
They are unbeaten in their last five league matches and are up to tenth in the table, seven points clear of the relegation zone.
Wenger had said confidence was low at the Emirates Stadium and it showed as Seagulls skipper Lewis Dunk opened the scoring on seven minutes before Glenn Murray doubled the advantage.
While Arsenal are low on self-belief, Brighton are flying as they remain unbeaten in all competitions since January 20, have two players up for the Premier League player of the month award and, in Hughton, a boss nominated for the manager’s accolade.
That stark contrast in form showed early on as Brighton took the lead from a run of the mill corner, Petr Cech far too easily beaten in the air by Shane Duffy, who headed back across goal for Dunk to slam in the opener.
Wenger’s side were seemingly under threat every time Brighton broke clear, and Shkodran Mustafi was forced to block Jose Izquierdo’s effort behind and Dunk headed over when well-placed from the resulting set-piece.
The recalled Alex Iwobi then played Arsenal into trouble, smashing a clearance straight at Anthony Knockaert, who should have scored after exchanging passes with Pascal Gross.
Further individual errors would cost Arsenal later in the half as Laurent Koscielny’s pass out of defence was misplaced and the Seagulls broke forward, with Gross crossing in for Murray to head home unmarked for his sixth goal in as many games, with Cech at fault once again.
Frustration began to creep into the Arsenal players, with Jack Wilshere picking up a booking for a poor challenge on Knockaert towards the end of the first half.
But they would halve the arrears before heading in for the break, Iwobi capitalising on some uncertain Brighton defending and passing to Granit Xhaka, whose pass was turned home by Aubameyang.
Koscielny came close to atoning for his earlier mistake as he crashed a header off the post in stoppage time, with Brighton hanging on to their lead as Stuart Attwell blew for half-time.
The second half started evenly, with Mesut Ozil stinging the palms of Mathew Ryan with a drilled effort before a flashpoint on 65 minutes as Sead Kolasinac, already booked, ploughed into Ezequiel Schelotto.
The Brighton man was forced off as a result but Kolasinac escaped further punishment for the incident, much to the dismay of the home support.
Wenger turned to Danny Welbeck , Eddie Nketiah and Hector Bellerin from the bench but it was Murray who scored for Brighton – only to have it rightly chalked off for offside.
Arsenal, in the manner true to a team chasing a result, had all of the ball in the closing stages with Aubameyang coming the closest to salvaging a point for his side, but they could not find the equaliser they craved.