West Ham produced a desperately disappointing display as Southampton eased to a 3-0 victory at the London Stadium.
It was another woeful performance by Slaven Bilic’s side and they remain in the relegation zone after managing to win only one of their first six Premier League encounters.
Saints created the first opening in the eighth minute when Pierre-Emile Hojbjerg saw his goalbound effort blocked by Angelo Ogbonna.
After a quiet period of play Southampton defended Dimitri Payet’s 25th-minute free-kick well before Hammers goalkeeper Adrian claimed Dusan Tadic’s teasing cross.
The visitors took the lead five minutes before the interval when Charlie Austin fired a left-footed shot past Adrian after good work by Ryan Bertrand and Tadic.
Southampton almost doubled their advantage before the interval with Adrian keeping Nathan Redmond’s shot out and Cedric Soares firing into the side-netting.
Bilic’s side seemed completely devoid of confidence and Tadic should have made it 2-0 in the 52nd minute after being set up by Soares but Adrian made a smart save to deny him.
Tadic went close with another shot on the hour mark before scoring 60 seconds later. Adrian raced out of his goal only to miss Austin’s ball forward allowing Tadic the simple task of rolling it into an empty net.
As the home fans grew increasingly disconsolate, Steven Davis lashed a shot over the bar as the visitors threatened to run riot.
Davis had another effort blocked before the home team finally roused themselves but Payet wasted their best opportunity, seeing his effort blocked by the outstanding Virgil van Dijk, who later cleared the ball off the line.
Substitute James Ward-Prowse added a third goal in stoppage time as Southampton moved into the top half of the table.