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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Live text, video and reaction from Saturday's fourth-round ties
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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.
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Line-ups
Match Stats
Live Text
Line-ups
Southampton
Formation 4-4-2
44Forster
2Walker-Peters35Bednarek5Stephens3Bertrand
17Armstrong8Ward-Prowse27Diallo32Walcott
9Ings10Adams
44Forster
2Walker-Peters
35Bednarek
5StephensBooked at 56mins
3BertrandBooked at 83mins
17Armstrong
8Ward-Prowse
27Diallo
32Walcott
9IngsSubstituted forLongat 85'minutes
10AdamsSubstituted forN'Lunduluat 78'minutes
Substitutes
7Long
18Valery
29Vokins
31Ramsay
40N'Lundulu
41Lewis
64Jankewitz
65Watts
72Chauke
Arsenal
Formation 4-2-3-1
1Leno
2Bellerín16Holding6Gabriel17Cédric Soares
25Elneny34Xhaka
19Pépé12Willian35Martinelli
30Nketiah
1Leno
2BellerínSubstituted forLacazetteat 72'minutes
16Holding
6Gabriel
17Cédric Soares
25ElnenySubstituted forParteyat 58'minutes
34Xhaka
19Pépé
12Willian
35MartinelliSubstituted forSakaat 58'minutes
30Nketiah
Substitutes
7Saka
9Lacazette
13Rúnarsson
15Maitland-Niles
18Partey
21Chambers
23David Luiz
28Willock
33Ryan
Referee: Peter Bankes
Match Stats
Home TeamSouthamptonAway TeamArsenal
Possession
Home38%
Away62%
Shots
Home11
Away11
Shots on Target
Home2
Away2
Corners
Home7
Away5
Fouls
Home9
Away7
Live Text
Post 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