Match ends, West Ham United 1, Southampton 3.
- West Ham loan signing Alex Song unveiled before kick-off
- Noble's long-range shot gives Hammers the lead
- Schneiderlin scores either side of half-time for Southampton
- Pelle gets first goal in England in Koeman's first league win
Morgan Schneiderlin scored twice as Southampton picked up a first Premier League win under Ronald Koeman with a comfortable victory at West Ham.
The Hammers led when Mark Noble scored with a deflected shot from 30 yards.
But the Saints equalised as Schneiderlin turned in at the second attempt from Dusan Tadic's free-kick.
Schneiderlin finished from James Ward-Prowse's cross before Graziano Pelle made it three after Nathaniel Clyne's right-wing cross was blocked by Adrian.
After a difficult start to life at Southampton, with a host of his top players moving on, the only disappointment for Koeman was that his team squandered chances to make it an even more routine afternoon.
Rickie Lambert, Adam Lallana, Dejan Lovren, Luke Shaw and Callum Chambers all left in the close-season but Schneiderlin was told he would not be allowed to follow them, despite interest from Tottenham.
The Frenchman has since started all three of his team's Premier League matches and demonstrated why his club are so keen to keep him when he brought them level moments before half-time and gave them the lead halfway through the second period.
Italian striker Pelle, a summer signing from Feyenoord, added a third to ensure the scoreline went some way to reflecting a dominant performance.
Having only won seven home matches in the Premier League last season and with manager Sam Allardyce under pressure to play more attractive football, they have now lost all three games in front of their own fans in the new campaign, including a League Cup exit on penalties to League One Sheffield United.
The hosts did, however, make the most of a brief spell of pressure just before the half-hour.
First Stewart Downing saw his free-kick blocked, then Ricardo Vaz Te had a low effort turned wide by the foot of Fraser Forster.
And they moved in front when Mauro Zarate robbed Schneiderlin in midfield and found Noble, whose effort from long distance glanced off Maya Yoshida and past Forster.
But the hosts could not protect the lead even as far as the interval.
Pelle had a header cleared off the line by Aaron Cresswell before Tadic's free-kick from the left found Schneiderlin on his own at the far post. The midfielder's first attempt was blocked by Joey O'Brien, but he curled in at the far post with his second.
After the break, Southampton's Shane Long had a drive pushed around the post by Adrian following a smart turn and Tadic could only produce a weak effort, also saved by the Hammers goalkeeper, after a quick break.
From the corner that followed, Schneiderlin lifted a shot well over the bar from around eight yards.
With West Ham complaining they should have had a goal kick, Southampton took a corner quickly, Ward-Prowse picked out Schneiderlin and he turned in at the near post to punish loose defending by the home side.
Southampton were still doing all the attacking and sealed the win when Clyne's cross was palmed away by Adrian and Pelle thumped in the rebound on the half-volley.
West Ham manager Sam Allardyce:
"We weren't good enough. Southampton taught us a lesson. We weren't sharp enough, didn't retain the ball as well as they did or close down as well as they did, and we gifted them two goals.
"As much as they were in control and on top of the game, we've lost two very stupid goals from set-pieces.
"The big problem I had with the corner [for the second goal] was that it was a goal-kick of course. Having looked at it from [referee] Mike Dean's position, he's got it horribly wrong when we don't need it to go against us."
Southampton manager Ronald Koeman:
"After they went 1-0 up it was difficult with the second ball because they played the long ball and long throw-ins. We knew that but we didn't dominate it and luckily it was 1-1 near half-time and that gave us belief to play and play to win. That's what I liked in the second half - we played with pressing, deserved to win and scored some great goals.
"Morgan Schneiderlin is a great player and it's normal that we like to keep that kind of player in our squad. He was wonderful in midfield. He has great quality and I enjoyed it.
"We said that from the beginning [that Schneiderlin will not be leaving] and we'll keep that until the end [of the transfer window]."
- 17O'BrienBooked at 62mins
- 3CresswellBooked at 56mins
- 10ZárateSubstituted forMorrisonat 57'minutes
- 12Vaz TeSubstituted forDiaméat 58'minutes
- 24ColeSubstituted forE Valenciaat 79'minutes
- 31E Valencia
- 6José Fonte
- 16Ward-ProwseSubstituted forCorkat 71'minutes
- 7LongSubstituted forRamírezat 66'minutes
- 19PellèBooked at 79mins
- Mike Dean
- Shots on Target
Second Half ends, West Ham United 1, Southampton 3.
Corner, Southampton. Conceded by Stewart Downing.
Foul by Gastón Ramírez (Southampton).
Winston Reid (West Ham United) wins a free kick in the defensive half.
Dusan Tadic (Southampton) wins a free kick on the left wing.
Foul by Joey O'Brien (West Ham United).
Foul by Steven Davis (Southampton).
Mohamed Diamé (West Ham United) wins a free kick in the defensive half.
Jack Cork (Southampton) wins a free kick in the defensive half.
Foul by Cheikhou Kouyaté (West Ham United).
Jack Cork (Southampton) wins a free kick in the attacking half.
Foul by Cheikhou Kouyaté (West Ham United).
Goal! West Ham United 1, Southampton 3. Graziano Pellè (Southampton) left footed shot from the centre of the box to the top left corner.
Dangerous play by Graziano Pellè (Southampton).
James Tomkins (West Ham United) wins a free kick in the defensive half.
Substitution, West Ham United. Enner Valencia replaces Carlton Cole.
Graziano Pellè (Southampton) is shown the yellow card.
Foul by Graziano Pellè (Southampton).
Aaron Cresswell (West Ham United) wins a free kick in the defensive half.