A strong Southampton side knocked holders Arsenal out of the FA Cup at the fourth-round stage courtesy of a first-half own goal.
The Saints were rewarded for their attacking intent in the opening period when Gabriel turned in Kyle Walker-Peters' cross in the 24th minute.
It was the first goal Arsenal had conceded in 508 minutes as they suffered a first loss in seven matches.
Southampton will face another Premier League side, Wolves, in the next round.
With their next opponents enduring a poor run in the league and having struggled in their 1-0 win at non-league Chorley on Friday, the 1976 winners will fancy their chances of progressing further at Molineux.
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The Saints also went close through Che Adams, whose low, angled strike was saved brilliantly by Bernd Leno, and James Ward-Prowse, who saw his delivery from a corner come off the bar.
Arsenal were without striker Pierre-Emerick Aubameyang and midfielder Emile Smith Rowe, while another in-form player, Bukayo Saka, was only introduced in the second half.
Mikel Arteta's Gunners side were tepid as an attacking force during the first 45 minutes, but looked more of a threat after the break.
However, Eddie Nketiah's deflected shot in the 67th minute, which was superbly dealt with by home goalkeeper Fraser Forster, was their only effort of note.
- Line-upsMatch StatsLive Text
Line-upsSouthampton
Formation 4-4-2
44Forster2Walker-Peters35Bednarek5Stephens3Bertrand17Armstrong8Ward-Prowse27Diallo32Walcott9Ings10Adams
- 44Forster2Walker-Peters35Bednarek5StephensBooked at 56mins3BertrandBooked at 83mins17Armstrong8Ward-Prowse27Diallo32Walcott9IngsSubstituted forLongat 85'minutes10AdamsSubstituted forN'Lunduluat 78'minutes
Substitutes
- 7Long18Valery29Vokins31Ramsay40N'Lundulu41Lewis64Jankewitz65Watts72Chauke
Arsenal
Formation 4-2-3-1
1Leno2BellerÃn16Holding6Gabriel17Cédric Soares25Elneny34Xhaka19Pépé12Willian35Martinelli30Nketiah
- 1Leno2BellerÃnSubstituted forLacazetteat 72'minutes16Holding6Gabriel17Cédric Soares25ElnenySubstituted forParteyat 58'minutes34Xhaka19Pépé12Willian35MartinelliSubstituted forSakaat 58'minutes30Nketiah
Substitutes
- 7Saka9Lacazette13Rúnarsson15Maitland-Niles18Partey21Chambers23David Luiz28Willock33Ryan
Referee:Peter BankesMatch StatsHome TeamSouthamptonAway TeamArsenalPossessionHome38%Away62%ShotsHome11Away11Shots on TargetHome2Away2CornersHome7Away5FoulsHome9Away7Live TextPost update
Match ends, Southampton 1, Arsenal 0.
90'+4'Full Time
Second Half ends, Southampton 1, Arsenal 0.
90'+3'Post update
Attempt missed. Eddie Nketiah (Arsenal) right footed shot from the right side of the box is close, but misses the top right corner. Assisted by Willian with a headed pass.
90'+2'Post update
Cédric Soares (Arsenal) wins a free kick in the defensive half.
90'+2'Post update
Foul by James Ward-Prowse (Southampton).
90'+2'Post update
Corner, Southampton. Conceded by Granit Xhaka.
88'Post update
Corner, Southampton. Conceded by Rob Holding.
85'Substitution
Substitution, Southampton. Shane Long replaces Danny Ings.
84'Post update
Attempt missed. Nicolas Pépé (Arsenal) left footed shot from a difficult angle and long range on the right is too high from a direct free kick.
83'Booking
Ryan Bertrand (Southampton) is shown the yellow card for a bad foul.
83'Post update
Nicolas Pépé (Arsenal) wins a free kick on the right wing.
83'Post update
Foul by Ryan Bertrand (Southampton).
82'Post update
Attempt saved. Danny Ings (Southampton) right footed shot from outside the box is saved in the centre of the goal. Assisted by Ibrahima Diallo with a headed pass.
81'Post update
Foul by Thomas Partey (Arsenal).
81'Post update
Ryan Bertrand (Southampton) wins a free kick on the left wing.
80'Post update
Offside, Arsenal. Eddie Nketiah tries a through ball, but Nicolas Pépé is caught offside.
78'Post update
Offside, Arsenal. Willian tries a through ball, but Alexandre Lacazette is caught offside.
78'Substitution
Substitution, Southampton. Daniel N'Lundulu replaces Che Adams.
75'Post update
Corner, Arsenal. Conceded by Kyle Walker-Peters.
75'Post update
Attempt blocked. Willian (Arsenal) right footed shot from the left side of the box is blocked. Assisted by Nicolas Pépé.
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- You can stream five fourth-round games live on the BBC this weekend, including Liverpool's trip to Manchester United. Find out more here.
Source: bbc.com