A few jitters are starting to creep in at the back for Arsenal. Laurent Koscielny mis-controls a long hoof forward into the path of Shane Long and his second touch is a successful tackle.

That could have easily been a lot worse for the visitors.

Here are all of Cuco Martina's touches so far. Can you spot the one for the goal?

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Shane Long is back into the fray after getting a small cut on his head and undergoing a spot of sideline treatment.

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James Ward-Prowse takes a touch on the edge of the box, wraps his right foot around the ball but sends it soaring well north of the bar.

Southampton are a yard quicker and a few IQ cleverer after that opening goal.

This is a real test of Arsenal's title chops.

Southampton are buzzing on the back of that super-strike from Cuco Martina.

We have just seen another replay of his outside-of-the-foot screamer - it swerved like a toe-poked beach ball.

It's flown in. Cuco caught it as sweet as a satsuma.

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Steve Claridge
BBC Radio 5 Live at St Mary's

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"From where we are there is no way that can go in, speculative at best. It bends, curls and stays at the same height. To beat Cech from that sort of distance, with the outside of the foot, that is magnificent. What wonderful technique, what a wonderful strike!"

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This is Cuco Martina's first Premier League start. It is his first league appearance since September.

He won't have to wait much longer for his next judging by that.

Simon Davis header drops to the full-back 30 yards out and he hits an absolute pearler, off the outside of his left peg, right into the bottom corner past a helpless Petr Cech.

Goal of the season longlist at the very least.

Big chance!

Arsenal go as Route One as Arsenal ever do - Mesut Ozil clipping a little pitching wedge of a cross in towards Olivier Giroud. The Frenchman doesn't make a clean connection but the ball drops loose to Nacho Monreal in the box.

Ten yards out and he duffs it straight at the goalkeeper.

Spotters badge in the post to you Mr Ramsey.

The Arsenal midfielder, 25 today, knocks a superb cross-field pass blind into the path of the on-bombing Nacho Monreal.

Monreal's low cross takes a nasty deflection and threatens to loop up over Maarten Stekelenburg before settling on the roof of the net.

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Everything threatening from Southampton is coming though Sadio Mane. His is a bigger box of tricks than Paul Daniels.

It takes three defenders to snuff out the danger posed by the Senegalese around the box.  

Sadio Mane climbs aboard the showboat with a extravagant backheel pass towards James Ward-Prowse. It is cut out by the Arsenal midfield though so he will have to hope his artistic marks make up for a lack of technical execution.

Steve Claridge
BBC Radio 5 Live at St Mary's

"This year you get the feeling with the way that the league is wide open, and how people are dropping points, that Arsenal have a great chance to go on and win it."

Shane Long is living on the wrong side of the linesman's law and is caught offside for the third time in less than 10 minutes.

Modelling his game on Pippo Inzaghi clearly. 

Southampton are pressing quite high on Arsenal and the Gunners have to resort to knocking it long as Mathieu Flamini gets a little flustered in possession.

A good position for a free-kick as Olivier Giroud is clobbered from behind, but Mesut Ozil's lofted ball into the box is too far in front of Per Mertesacker who has rolled up from the back.

Steve Claridge
BBC Radio 5 Live at St Mary's

"That was a great chance, Fonte fell to the ground but that was a terrible header - there was no pressure on him at all."

Olivier Giroud wins an early corner for Arsenal and has a decent chance to convert it into an early lead for his side, but the France international plants his header over the top as he rises unchallenged to meet the delivery from the left.