First-half goals from Victor Moses and Diafra Sakho gave West Ham a superb win over Manchester City, which got a goal from Kevin De Bruyne.
Leader Manchester City was beaten for the first time this season as West Ham collected a stunning 2-1 win at the Etihad Stadium.
Slaven Bilic's men returned with three-point hauls from their opening two away matches at Arsenal and Liverpool and they continued a remarkable run on their travels by halting City's 100 percent record.
Victor Moses netted a sublime early opener and Diafra Sakho doubled the lead – as he did when West Ham beat the same opponent at Upton Park last season.