Haller scored the decisive goal
Sebastien Haller’s superb strike consigned winless Sheffield United to another Premier League defeat as West Ham moved into the top half of the table.
The Blades, who have lost eight of their nine fixtures this term, stay bottom of the table while West Ham climb to eighth.
Chris Wilder’s side had started brightly and created several early openings but the Hammers took control as the hosts faded as an attacking force.
Vladimir Coufal and Tomas Soucek both had opportunities to score before Haller’s powerful 20-yard drive found the top-right corner.
Declan Rice then headed against the crossbar as the visitors sought to press home their advantage.
Sheffield United did rally, with Oli McBurnie seeing a left-foot effort cannon back off the crossbar, but they are still yet to score in open play at Bramall Lane this season.
