Anthony Martial at the double as Manchester United come back for victory
Anthony Martial continued his dream start to life at Manchester United as he scored twice in their comeback victory at Southampton.
Last year it was Robin van Persie who scored twice in a narrow win for Louis van Gaal's side at St Mary's but now United supporters have a new hero as their £36million deadline-day signing continued his impressive start to life in the Premier League.
Graziano Pelle scored the first and last goals of the game but Martial levelled before the break and benefited from a lapse in concentration from Maya Yoshida to put United in front early after the break, with Juan Mata also on the scoresheet in the 3-2 win.
David De Gea, so nearly a late departure in the transfer window, also shone for United, with one save from Jose Fonte in particular key to the win.
The visitors started poorly as their defence failed to cope with the movement from Southampton's front four and it was only a matter of time before they were made to pay.
The challenge for Daley Blind at centre-back was always going to come from Pelle, so good in the air, and the Italian got the better of their first aerial dual to set away a Southampton attack that ended with Dusan Tadic firing just wide.
Marcos Rojo did well to clear a Tadic cross away from the onrushing James Ward-Prowse as Saints started to turn the screw.
And it was from the very next attack that the home side opened the scoring as Ward-Prowse's perfect centre was turned towards goal by Sadio Mane, with De Gea only able to push his save into the direction of Pelle who made no mistake in tucking away the rebound.
United were in no way a cohesive unit in defence and more sloppy play saw Pelle played in behind but this time his effort came back off the post.
Morgan Schneiderlin's aimless header was collected by Mata, who was in an offside position, and as he ran into the box he was well challenged by Yoshida with the ball falling to Martial - who showed composure to control and finish well to level the game.
A short corner routine saw Schneiderlin get away a shot that was deflected behind as United began to enjoy a sustained period of pressure for the first time in the game.
Van Gaal's side were ahead five minutes into the second half as Yoshida played a tame back-pass towards Maarten Stekelenburg which Martial latched onto before slotting home to turn the game around.
The mistake from the Japan defender seemed to breed indecision in the Saints back four and it was skipper Jose Fonte who was next to surrender possession - with Memphis Depay screwing a shot just wide.
Fonte came close to drawing the hosts level but his near-post header from Tadic's corner was superbly pushed away by De Gea.
And it proved to be a timely save as United began to show that Van Gaal's possession-based football does have its benefits as they kept the ball well and were soon two goals clear.
Depay found space in the box after the visitors had passed Southampton to death, drilling an effort off the post with Mata on hand to convert the rebound and all but kill off the contest.
Mata and Depay both missed the target with free-kicks won by the bustling Martial and the final four minutes was made more interesting as Pelle headed home his second after smart work from Mane.
With five minutes of injury time remaining there was still time for De Gea to again show why he is so vital to United as the Spaniard palmed Victor Wanyama's shot behind for a corner while at full stretch.
That was the last chance for Southampton who could not muster up another - with the three points taking United up to second place in the table with only neighbours Man City ahead of them.
TWEET OF THE MATCH
@usainbolt: "ManUtd don't play with the game.. We need these 3 points" - sprint ace and United fan Usain Bolt was edgy in the closing stages.
Maarten Stekelenburg: 6 (out of 10)
Maya Yoshida: 5
Jose Fonte: 6
Virgil van Dijk: 6
Matt Targett: 6
Victor Wanyama: 7
Oriol Romeu: 7
James Ward-Prowse: 7
Sadio Mane: 7
Dusan Tadic: 6
Graziano Pelle: 8
Cuco Martina: 6
Steve Davis: 6
Shane Long: 6
David De Gea: 9
Matteo Darmian: 6
Chris Smalling: 6
Daley Blind: 5
Marcos Rojo: 6
Michael Carrick: 6
Morgan Schneiderlin: 7
Memphis Depay: 7
Wayne Rooney: 6
Juan Mata: 7
Anthony Martial: 9
Antonio Valencia: 6
Bastian Schweinsteiger: 7
Paddy McNair: 6
Anthony Martial: Kept his role as United's main striker despite the return of Rooney and continued where he left off against Liverpool. Was not always involved in the contest but showed such composure to draw United level before being alert enough to add his second shortly after half-time. Starting to pay off that hefty transfer fee already.
MOMENT OF THE MATCH
David De Gea: Some blamed Sergio Romero for both goals United conceded in defeat at Swansea but De Gea is now back between the sticks and his save from Fonte in the second half showed why he is considered one of the best goalkeepers in the world. As good as a goal for the Red Devils, who again had their Spanish number one to thank for playing a key role in a win.
VIEW FROM THE BENCH
Neither Louis van Gaal nor Ronald Koeman has ever tasted home league success over the other and their simmering rivalry continued with old master van Gaal coming out on top. Koeman would have been disappointed to surrender a lead his side should have built upon whereas the United boss saw his side move up to second in the table after a comeback victory.
MOAN OF THE MATCH
Wayne Rooney still is not quite at it for United this season. Van Gaal deployed his skipper in the hole behind Martial but he was a peripheral figure for much of the game and was never a goal threat. The pressure of getting the goals has been taken off of his shoulders but he will need to show he still contributes to the side in other ways.
WHO'S UP NEXT
MK Dons v Southampton (Capital One Cup, September 23)
Man Utd v Ipswich (Capital One Cup, September 23)
United's former Southampton midfielder Schneiderlin said: "It was strange to go to the away dressing room but I'm a Manchester United player today and I'm very happy with the victory.
"We know Premier League games are never finished and we could have done better with the second goal - but Anthony is an amazing talent."
Saints defender Fonte, denied by De Gea, added on Sky Sports One: "I thought it was in but unfortunately he showed why he is considered one of the best in the world.
"I'm disappointed with the way we conceded the goals. I thought we could have done better with the first and the second was a mistake - it can happen but we lost our way a little bit after that."