That's all I've got time for tonight.
Head to our Premier League live page for all the reaction from St Mary's and tonight's other five top-flight matches.
That's it, the full-time whistle blows.
Late goals from Maya Yoshida and James Ward-Prowse seal victory for Saints.
Hull's victory over Middlesbrough mean Crystal Palace slip closer to the relegation zone.
Jason Puncheon bends over a free-kick for Palace but Fraser Forster tips it over.
That could be the last chance for the visitors.
Both sides have made substitutions. Mathieu Flamini replaces Luka Milivojevic for Palace and Jay Rodriguez is on for Nathan Redmond.
There will be four minutes of injury time.
Cedric Soares finds some room down the right, finds James Ward-Prowse in the centre of the box and he places it past Wayne Hennessey.
Two goals in the blink of an eye.
Maya Yoshida may have won the game for Saints!
The Japan defender has an easy tap in from Jack Stephens' pass.
Crystal Palace are putting their bodies on the line to keep hold of this point.
An unmarked Steven Davis runs onto a square ball but his shot is brilliantly blocked by the wall that is Mamadou Sakho.
Davis pounces on the follow-up but Damien Delaney gets in the way and it's out for a corner.
Cedric Soares becomes the second Palace player to go into the book for a rather cynical foul on Bakary Sako.
The Portugal right-back has no complaints.
Crystal Palace goalkeeper Wayne Hennessey is proving a formidable force between the sticks once again.
The Wales international first tips Oriol Romeu's deflected strike from outside the box wide, before holding onto Maya Yoshida's header from the corner.
Around 15 minutes left for someone to find a winner.
Shane Long can't score tonight, but that's fine defending from the forward.
Palace defender Damien Delaney attacks a corner, it's heading towards goal, but Long heads away.
Good pressure from the visitors.
Southampton midfielder Oriol Romeu goes into the book for a clumsy challenge on Wilfried Zaha.
It's the midfielder's 10th booking of the season and he'll be banned for Saints' next two games.
How many chances does Shane Long want?
The Southampton striker latches onto a long ball over the top from Dusan Tadic - he's clean through, but his shot lacks enough power to beat Wayne Hennessey who tips it wide.
It was a fine save but he had to give the keeper no chance at all.
Palace hit the post for the second time!
Martin Kelly finds some room in the box and crashes a shot against the upright.
Wilfried Zaha sends the rebound well wide.
Just under 30 minutes to go and a draw is unlikely to help either of these sides looking at the other scores.
Hull are beating Middlesbrough and Swansea are leading Tottenham.
As things stand, Saints and Palace will be slipping closer to the relegation zone.
Crystal Palace make their second switch of the evening.
Damien Delaney replaces Jeffrey Schlupp.
It appears Sam Allardyce is resorting to three at the back as he did at Stamford Bridge at the weekend.
It's not Shane Long's night.
Dusan Tadic plays a perfectly weighted ball through to the Southampton striker who tries to lift it over Wayne Hennessey but he gets too much on it and it goes over.
He probably should have scored.
Goodness me, that would have been a contender for goal of the season if it had gone in!
Palace's Andros Townsend hooks the ball over his head from the centre of the penalty area and the ball lands on the roof of the net.
It took a slight deflection and a corner is given, but nothing comes of it.
How close is that?!
Nathan Redmond does brilliantly to control the ball on the touchline and pull it back to James Ward-Prowse on the penalty spot, but his fierce shot is blocked by Mamadou Sakho.
The ball then finds Cedric Soares who lets fly, but his effort goes inches wide.
The Crystal Palace players seem much calmer after their half-time cup of tea.
It threatened to get ugly before the break following the Southampton equaliser.
I'm sure it's not the last we'll hear about that one.
Southampton get us back under way at St Mary's.
Crystal Palace have made a substitution at half-time - Bakary Sako is on for Yohan Cabaye.
It was certainly a first half with plenty of talking points.
Christian Benteke's close-range strike following a superb team move put Crystal Palace ahead.
Southampton then had two penalty appeals waved away in the final few minutes of the half, before Nathan Redmond slotted in an equaliser on the stroke of half-time.
Wilfried Zaha has to be restrained by his own players after the half-time whistle is blown. He's furious.
It all stemmed from what he thought was a foul by Steven Davis on the touchline before the move that led to Southampton's equaliser.
Hmm, there's a bit of controversy about this goal!
Wilfried Zaha appears to be barged over by Steven Davis the touchline, but Southampton play on - Davis sends the ball into the box and Nathan Redmond slots in from 12 yards.
It almost happened in slow motion.
Goodness me, Southampton claim they should have another penalty.
Shane Long looks like he has the legs on Luka Milivojevic and falls to the ground as the pair tangle legs.
Again, Roger East waves away the protests, but it's another one that could have been given.
Dusan Tadic is livid - he thinks Southampton should have a penalty.
The midfielder tries to take it past Jeffrey Schlupp and the ball appears to strike the former Leicester defender's arm in the box.
It wasn't clear cut, but I've certainly seen them given.
Crystal Palace are oozing confidence now.
Christian Benteke nods a cross back towards Wilfried Zaha, but he can't control his volley and skies over.
The bounce did him to be fair.
The atmosphere has gone flat at St Mary's after that Christian Benteke opener for Palace.
A 3-0 win for Sam Allardyce's side would move them above Saints in the table.
That's as good a team goal as you will ever see - and it's finished off by Christian Benteke.
It all starts on the left with Jeffrey Schlupp, Wilfried Zaha sucks in Saints' defenders, the ball works its way across to Andros Townsend on the right-hand side of the area and the winger finds Benteke to fire in from a couple of yards.
It's the Belgian's 11th Premier League goal of the season.
It's another chance for Crystal Palace - this time for Wilfried Zaha.
Christian Benteke nods it down into the path of the winger in the centre of the box, but his fierce strike is brilliantly blocked by Oriol Romeu.
Perhaps a bit more composure needed from Zaha, but Romeu threw everything at it.
That's brilliant from Christian Benteke.
The big Belgian nutmegs Saints defender Jack Stephens and fires towards goal but his shot is blocked.
The trickery was George Best-esque, I kid you not.
That's a super save from Palace goalkeeper Wayne Hennessey.
Nathan Redmond, not known for his heading ability, connects with Cedric Soares' cross from the right but Hennessey dives full stretch and tips it around the post.
The game has finally settled down after a frantic opening.
Southampton look good on the ball, but the lack of cutting edge from the Bournemouth draw has continued so far.
Plenty of time for things to change.
Luka Milivojevic comes so close to putting Palace ahead.
The Serbia midfielder curls a low free-kick from 25 yards around the wall but it strikes the outside of the post.
Southampton goalkeeper Fraser Forster was rooted to the spot.
And now Southampton have another chance. Shane Long latches onto a long ball but slices it wide from a tight angle.
It was much more difficult than his one in the opening 40 seconds.
Christian Benteke has to do better there. The Belgian gets his head on Yohan Cabaye's corner but can't connect properly and it spins wide.
He was pretty much unmarked. Palace's first chance.