- Alexis Sanchez puts Arsenal ahead on the hour.
- Substitute Olivier Giroud heads home seven minutes from time.
- Arsenal leapfrog Manchester United and go fifth with first win at St Mary's for 14 years.
- Arsene Wenger bidding to maintain 100% of qualifying for the Champions League in every season at the helm.
- Recap: Atletico Madrid (2) 2-1 (4) Real Madrid
Well that brings an end to our live coverage for another night. We're back with live coverage of Manchester United vs Celta Vigo in the second leg of the Europa League semi-final tomorrow night. But until then, it's goodbye.
Chants of "Wenger Out!" come from the away end at full time but the Arsenal support do have something to shout about.
They now trail Manchester City by three points with three games left, and four behind Liverpool with a game in hand. Jurgen Klopp's side must win their last two games to secure a top four spot, but any slip up will let the Gunners in.
Full time: Southampton 0-2 Arsenal
Arsenal's Champions League remain alive after they overcome a limp Southampton at St Mary's. Alexis Sanchez goes to 20 league goals for the season and he opened the game up with a superb opener and by the time Olivier Giroud had netted a second they had complete control of the contest. Saints played like a team with nothing but mid-table position to play for.
Three added minutes by the looks of things. Time for another for Arsenal?
GOAL! Southampton 0-2 Arsenal (Olivier Giroud)
Too easy and Arsenal are going to win at Southampton for the first time for 14 years. Aaron Ramsey heads across goal from Sanchez's raking pass and Giroud rises unchallenged to head past Forster.
Alexis Sanchez celebrates putting Arsenal ahead.
Jay Rodriguez and Olivier Giroud on for each side. Ten minutes left. Will we see a second goal?
Southampton have found a second wind here and Boufal is always willing to make something happen. He twists and turns on the edge of the Arsenal box but when he takes aim if flies out of play; closer to Portsmouth than the goal.
Boufal and Long on for Southampton. Redmond and Ward-Prowse off.
Xhaka's drive is pushed away by Forster as Arsenal look to put the game to bed. One-way traffic since the goal.
Watch Alexis Sanchez goal which has put Arsenal in front at Southampton.
GOAL! Southampton 0-1 Arsenal (Alexis Sanchez)
A shocking game lite up by a fantastic goal. Sanchez plays the ball into space for Xhaka to run onto to and when Ozil plays a first time pass back to the Chilean he takes the ball in his stride cuts inside two Southampton defenders and hammers past Forster. Brilliant finish and the one moment of quality leads to the opening goal. Thank the lord.
Not a great night so far for Alexis Sanchez.
Foul throw from Alexis Sanchez. Not good. Though it is his most worthwhile contribution of the evening.
Back underway at St Mary's. No changes at the break.
No shots on target from Arsenal in that first half and yet this is a game they have to win. Southampton have not been much better with Cech having to save from Gabbiadini and Redmond. But my goodness, entertainment has been at a premium.
Half time: Southampton 0-0 Arsenal
I give up, go and watch the Madrid derby. This is a horrible game.
Only two added minute, mercilessly.
Yellow card for James Ward-Prowse who hauls back Danny Welbeck who was away as Arsenal broke forward.
Nathan Redmond illuminates a terrible first half with the stand-out moment, a flashing drive which forces Cech into turning the ball over the bar. Fine save by the Arsenal stopper.
Shkodran Mustafi flies in with a tackle where he wins the ball but Jon Moss awards a free-kick. The less I say about Moss the better I would think.
Gabbiadini is the favourite from the set-piece and he curls wide of goal. Cech unmoved.
Hector Bellerin on for Arsenal. Nine minutes to go until half time, and that can't come soon enough.
Jack Stephens tackles brilliantly to deny Mesut Ozil the chance to take aim. Alex Oxlade-Chamberlain is down meanwhile receiving treatment and he looks like he's going off. His return to St Mary's has lasted 35 minutes.