Yoane Wissa thumped home a stoppage-time winner as Brentford floored West Ham 2-1 at the London Stadium.
The Bees leapfrogged their opponents in the Premier League table, courtesy of DR Congo forward Wissa’s last-gasp strike.
Jarrod Bowen thought he had scrambled the Hammers a draw with his first goal in 15 Premier League games 10 minutes from time, but replacement Wissa blasted into the net after the hosts failed to clear from a Mathias Jensen free-kick.
Bowen’s low finish cancelled out Bryan Mbeumo’s opener for the Bees and almost grabbed West Ham a point.
But then Lukasz Fabianski parried Pontus Jansson’s head from Jensen’s whipped free-kick, and Wissa rushed onto the ball to deliver the killer blow.
West Ham paid the price for a host of missed chances and botched build-up, but the visitors impressed again as they continued their fine start to their debut Premier League campaign.