Arthur Masuaku scored a bizarre late winner as top-four hopefuls West Ham twice came from behind to beat Premier League leaders, Chelsea, 3-2 in a pulsating encounter at London Stadium.
Thiago Silva broke the deadlock for Chelsea in the first half, heading Mason Mount’s corner past Lukasz Fabianski via the inside of the post.
West Ham equalised when Mendy brought down Jarrod Bowen following a poor backpass from Jorginho, allowing Manuel Lanzini to stroke home from the penalty spot.
Chelsea restored their advantage in spectacular fashion, Mount sending a superb side-footed volley into the corner from Hakim Ziyech’s low cross for his second goal in two games.
Bowen’s low drive from the edge of the area restored parity once more before Masuaku’s remarkable 87th-minute winner.
After collecting the ball wide on the left, Masuaku beat Chelsea goalkeeper Edouard Mendy at his near post with a left-footed cross-cum-shot to send the Hammers supporters into ecstasy.
After saying Chelsea lacked “the right attitude” in their narrow victory at Watford on Wednesday, manager Thomas Tuchel will be bitterly disappointed at the manner in which they relinquished their grip on proceedings on Saturday.
The win ended West Ham’s run of three league games without a win since their magnificent 3-2 victory over Liverpool before the international break.
David Moyes’ team, operating with a back three of Craig Dawson, Moussa Diop and Kurt Zouma, soaked up Chelsea’s pressure before attempting to strike on the counter.
The win consolidated West Ham’s place in the top four, while Chelsea will drop to third if Manchester City and Liverpool win this weekend.
West Ham are now only six points behind Chelsea in the table and four ahead of Arsenal, who face Everton at Goodison Park on Monday.