Match ends, Southampton 0, Arsenal 5.
Theo Walcott struck a hat-trick and Danny Welbeck marked his first start since May 2016 with two goals and an outstanding individual performance as Arsenal thrashed Southampton to reach the FA Cup fifth round.
In a tie played out between two much-changed line-ups, Arsenal ruthlessly outclassed Southampton as Claude Puel's side came crashing down to earth after reaching the EFL Cup final with victory at Liverpool on Wednesday.
Welback, back in the starting line-up after that lengthy absence following knee surgery, put Arsenal in control with two cool finishes inside the first 22 minutes then set up Arsenal's third for Walcott before half-time.
The Gunners, with manager Arsene Wenger watching from the stands as he starts a four-match touchline ban, heaped further misery on Southampton after the break, sending on Alexis Sanchez as substitute to create two comfortable finishes for Saints product Walcott.
- BBC One is showing two live FA Cup ties on Sunday. Millwall host Watford at 12:00 GMT, followed at 16:00 GMT by holders Manchester United against Wigan.
- Relive Arsenal's FA Cup win at Southampton
Welbeck shows his quality
This was Welbeck's first start since May 2016 but there was not the slightest sign of rustiness as he settled to his task as if he had never been away.
Welbeck's end product has occasionally drawn criticism but it was as smooth as silk here, taking Lucas Perez's pass to loft a clever finish over Southampton's stand-in keeper Harry Lewis for his first, drawing Wenger out of his seat in the stand in delight.
He was at it again seven minutes later, bringing Alex Oxlade-Chamberlain's floated pass under his spell before showing composure once more to beat Lewis.
Welbeck then showed his awareness and value as a team player to cross for Walcott to react before any Southampton defender for a simple close-range strike for Arsenal's third.
Welbeck is due a run of good fortune with injuries and he demonstrated here that he brings tireless effort and work-rate to Arsenal's team as well as a goal threat. If he can finally put a run of games together after his long absence, he will be a key asset for Wenger.
Wenger wisely withdrew him after 64 minutes with the game safe, to a fully deserved standing ovation from the travelling fans.

Gunners spoil Southampton's party
There was a mood of celebration around St Mary's as supporters arrived for this FA Cup fourth-round tie - and rightly so after the outstanding victory over two legs against Liverpool sent them into the EFL Cup final against Manchester United at Wembley on 26 February.
Saints' boss Puel pointed clearly to his priorities with 10 changes from the team that won at Anfield, only defender Jack Stephens keeping his place in the starting line-up.
And how it showed as Southampton played like strangers to be ripped apart by Arsenal.
The party mood was deflated but Saints fans were in forgiving mood, with even the smattering of boos at half-time and at the end sounding very half-hearted, as if this team selection and Anfield hangover was to be expected.
Best seat in the house for Wenger

Wenger watched this emphatic Arsenal display from the comfort of a seat in the stand at St Mary's.
He was serving the first game in a four-match touchline suspension after accepting a Football Association charge of misconduct for verbally abusing and pushing fourth official Anthony Taylor in the win against Burnley at Emirates Stadium.
Wenger, who was also fined £25,000, barely had a moment of discomfort as his right-hand man Steve Bould took charge on the touchline.
There is no doubt the Gunners' boss would have preferred to be in his usual position on the touchline - but he was able to sit back and relax as Arsenal cruised into the FA Cup Fifth round.
Man of match - Danny Welbeck (Arsenal)

A first since Bendtner - the stats
- Theo Walcott scored his fifth Arsenal hat-trick and was the first Arsenal player since Nicklas Bendtner against Leyton Orient in March 2011 to score an FA Cup hat-trick.
- Welbeck scored and assisted in the same game for the first time since September 2014 against Aston Villa.
- Arsenal won an away game by five clear goals for the first time since August 2009 against Everton (6-1).
- The Saints recorded their heaviest home FA Cup defeat since February 1910, when they lost 5-0 to Manchester City.
- This was Southampton's joint-heaviest defeat at the St Mary's Stadium, equalling their 6-1 loss to Liverpool in the League Cup last season.
- Lucas Perez has been involved in eight goals in eight starts for Arsenal in all competitions (five goals, three assists) and assisted Welbeck's first goal in this game.
- Southampton have conceded twice or more in eight of their past nine FA Cup matches against top-flight opponents, doing so in each of their past five.
- Walcott has scored seven goals in his past four away FA Cup matches.
- Alexis Sanchez has had a hand in 11 goals in 10 FA Cup games for Arsenal (five goals, six assists).
- Walcott was the first player to score an FA Cup hat-trick against the Saints since Paul Rideout did so for Tranmere in February 2001, in their famous 4-3 victory.
'A good lesson'
Southampton manager Claude Puel: "I am responsible for the defeat. If I had to do other team at the start I would make the same because it is a difficult moment for us with all these games. We had nine players not available and I had to protect some players. It is not possible to play every three days with the same players and with some players with injuries.
"It was a good lesson, they are a great team. We started the game without good experience and were nervous. It was better in the final 10 minutes of the first half and in the second half it was interesting - it was a good reaction in the collective."
Arsenal boss Arsene Wenger: "We were very dynamic, explosive and overall we had a good consistent performance over 90 minutes and everybody played well.
"Welbeck has been out for such a long time, I didn't expect him to score straight away and it shows the desire is there.
"People say I make changes but I bring in Walcott, Welbeck and Perez, all top-quality players. After that I try to find the best balance for the team."
What next?
It's back to the Premier League on Tuesday as Southampton travel to Swansea looking to record their second successive win in the competition. Meanwhile, Arsenal are at home to Watford on the same night as they look to keep up the pressure on Premier League leaders Chelsea. The Blues are eight points clear of the Gunners.
Line-ups
Southampton
Formation 4-3-3
- 41Lewis
- 15Martina
- 24Stephens
- 5Gardos
- 38McQueen
- 23Højbjerg
- 18Reed
- 4Clasie
- 39Sims
- 7LongSubstituted forRedmondat 65'minutes
- 27IsgroveSubstituted forTadicat 64'minutes
Substitutes
- 3Yoshida
- 8Davis
- 11Tadic
- 14Romeu
- 21Bertrand
- 22Redmond
- 28Taylor
Arsenal
Formation 4-3-3
- 13Ospina
- 24Bellerín
- 20Mustafi
- 16Holding
- 3Gibbs
- 15Oxlade-Chamberlain
- 55Maitland-Niles
- 31Reine-AdelaideSubstituted forIwobiat 72'minutes
- 14Walcott
- 9Pérez
- 23WelbeckSubstituted forSánchezat 65'minutes
Substitutes
- 4Mertesacker
- 5Gabriel
- 7Sánchez
- 17Iwobi
- 18Monreal
- 25Jenkinson
- 26E Martínez
- Referee:
- Kevin Friend
- Attendance:
- 31,288
Match Stats
- Possession
- Home48%
- Away52%
- Shots
- Home14
- Away12
- Shots on Target
- Home2
- Away7
- Corners
- Home7
- Away4
- Fouls
- Home8
- Away5
Live Text
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Full Time
Second Half ends, Southampton 0, Arsenal 5.
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Foul by Alexis Sánchez (Arsenal).
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Josh Sims (Southampton) wins a free kick in the defensive half.
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Attempt saved. Lucas Pérez (Arsenal) left footed shot from the centre of the box is saved in the centre of the goal. Assisted by Alex Oxlade-Chamberlain with a through ball.
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Corner, Southampton. Conceded by Kieran Gibbs.
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Attempt saved. Josh Sims (Southampton) right footed shot from outside the box is saved in the bottom right corner. Assisted by Harrison Reed.
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Foul by Rob Holding (Arsenal).
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Pierre-Emile Højbjerg (Southampton) wins a free kick on the right wing.
Goal!
Goal! Southampton 0, Arsenal 5. Theo Walcott (Arsenal) right footed shot from the centre of the box to the bottom left corner. Assisted by Alexis Sánchez following a fast break.
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Foul by Héctor Bellerín (Arsenal).
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Josh Sims (Southampton) wins a free kick in the defensive half.
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Attempt blocked. Dusan Tadic (Southampton) left footed shot from the right side of the box is blocked.
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Alexis Sánchez (Arsenal) wins a free kick in the defensive half.
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Foul by Florin Gardos (Southampton).
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Attempt missed. Sam McQueen (Southampton) left footed shot from outside the box is close, but misses to the right. Assisted by Nathan Redmond.
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Alexis Sánchez (Arsenal) wins a free kick in the defensive half.
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Foul by Jordy Clasie (Southampton).
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Attempt blocked. Sam McQueen (Southampton) left footed shot from the left side of the box is blocked.
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Attempt missed. Jordy Clasie (Southampton) right footed shot from outside the box misses to the left following a corner.
Comments
Join the conversation
1. It isn't
2. They're sad
2016- Manchester Utd; 2015-Arsenal 2014-Arsenal 2013-Wigan 2012-Chelsea 2011-Manchester City 2010-Chelsea 2009-Chelsea
"Because the big clubs don't care about the FA Cup"
And someone quoting Piers Morgan as an expert below, yeah right- people do talk some absolute guff.
If they play like that next week then Chelsea wont live with them.
A poll was conducted earlier this season where 76% of fans don't care about the FA Cup and 59% want it scrapped entirely.
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I'm surprised someone still believes in polls... they have a record of getting things wrong lately.
From a neutral's standpoint, great to see Welbeck & Walcott back & firing.
Well done Clive, another anti Arsenal post making up the numbers in this HYS...
But come the summer you can look back to the day you posted an irrelevant, unoriginal, pointless comment...
Clive = A specialist in tedium...
You don't take Piers Morgan seriously do you.
I don't and I don't know of anyone that likes him.
@86 Win 'anything' Arsenal have won 4 trophies in the last 5 years....what are you writing sheer fiction for.
Already beat Chelsea easily, i think if we go at them can beat them again....
Only Sante C missing (big, big player) and squad has a lot of options.
The only fans not worrying about these games are The Arsenal fans.
One thing you can take to the bank, no parking a bus from AW, he will go for the win.
Cant't wait, bring it on!