Manuel Pellegrini's West Ham are up to fifth in the Premier League courtesy of a third win in eight days, against recently-promoted Norwich City.
Victory at Watford last weekend - United's first of the campaign - was followed by a 2-0 Carabao Cup success in Wales 72 hours later.And this afternoon, goals from Sebastien Haller and Andriy Yarmolenko sent the Hammers spiralling up the table as City were well and truly beaten by an impressive team performance.
Although the goalscorers will take the headlines it was Felipe Anderson who was chief tormentor as West Ham scored twice, had what appeared to be a fairly nailed-on penalty denied and forced several key saves from City 'keeper Tim Krul.
Meanwhile, at the other end of the field, Angelo Ogbonna and Issa Diop were on top form to deny the league's joint-leading goalscorer Teemu Pukki a shot on goal until the 90th minute, when the game was already lost.
The game, which started quietly with neither side registering an effort on goal until Anderson's blocked effort in the 16th minute burst into life when Haller opened his account at the LOS seven minutes later.
Some great work on the left by Arthur Masuaku saw him beat two players before delivering a low cross on the edge of the six-yard box, which an attentive Haller dispatched with aplomb.
And although the visitors hit the bar nine minutes into the second half - an effort from Todd Cantwell that was eventually ruled out for offside - it was West Ham who were to score what proved to be the game's decisive second goal.
With 56 minutes on the clock, Andriy Yarmolenko - who had gone to ground three times in the opening half in search of a penalty - struck the post, only to score some 40 seconds later when Norwich criminally conceded possession just outside their own penalty area.
The Ukranian drove into the box before finding Mark Noble, whose attempted pass was cut out - only to fall into the path of Yarmolenko, who volleyed home from a tight angle.
West Ham could perhaps count themselves slightly unlucky not to have been awarded a penalty and the chance to add a third with just seven minutes of time remaining, as Haller appeared to be tripped as he cut inside.
But referee Paul Tierney waved play on despite protestations from the French striker, who now has three goals to his name following a brace at Vicarage Road last weekend.
In the closing minutes Norwich goalkeeper Tim Krul made three excellent saves to prevent West Ham extending their lead, as the Hammers threatened to run riot against a well-beaten City side.
However manager Manuel Pellegrini will no doubt be content with the performance and result regardless, one that takes West Ham up to fifth in the Premier League with a tally of seven points from their opening four matches.
West Ham Utd: Fabianski, Fredericks, Diop, Ogbonna, Masuaku, Rice, Noble (Sanchez 85), Yarmolenko (Snodgrass 71), Lanzini, Anderson (Fornals 88), Haller.
Subs not used: Roberto, Zabaleta, Balbuena, Ajeti.
Goals: Haller (24), Yarmolenko (56).
Booked: Fredericks, Snodgrass.
Norwich City: Krul, Aarons, Godfrey, Zimmermann (Amadou 36), Lewis, Leitner, Trybull, Buendia, Cantwell (McLean 78), Stiepermann (Drmic 78), Pukki.
Subs not used: Fahrmann, Byram, Tettey, Vranic.
Booked: Aarons.
Referee: Paul Tierney.
Tickets sold: 59,950.
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