- City concedes for first time this season
- Hammers take 2-1 lead into half
- De Bruyne nets first City goal
- First WHU league win at Etihad since 2003
For the second-straight season, West Ham is flirting with the top of the table early in the season.
West Ham is now three points back of Man City for the top of the Premier League table.
[ RELATED: Watch full match replays ]
West Ham almost went down early when Yaya Toure powered a header that Adrian pushed over the bar.
Sergio Aguero missed a chance to equalize when he moved around a sliding Adrian but pushed his shot through traffic wide of the frame from 17 yards.
And Sakho netted off a scrum in the box to give the visitors a surprising 2-0 lead with an hour to play.
Adrian made a pair of tight saves on Aguero in the 40th minute, and sent the match to halftime 2-0.
Then De Bruyne calmly settled a pass from the left, setting up a curling low right-footed shot that beat a diving Adrian.
That set us up for a tense second half, as City endeavored to keep its unbeaten season in tact.
Yaya Toure twice missed on similar low drives from the right, the second coming closer to finding the far post.
Adrian made a stunning save of a Nicolas Otamendi header in the 86th minute.