James Ward-Prowse set up two goals on his West Ham debut and Lucas Paqueta scored a late penalty as the 10-man Hammers somehow secured a 3-1 win over Chelsea.
Ward-Prowse, the £30million signing from Southampton, created goals for Nayef Aguerd and Michail Antonio, either side Carney Chukwuemeka’s equaliser.
But Mauricio Pochettino’s expensively-assembled side will wonder how on earth they came away from the London Stadium empty-handed.
Enzo Fernandez missed a penalty and West Ham had to play the final 25 minutes a player down after Aguerd saw red.
Yet not only did David Moyes’ side cling on for a first win of the season, they wrapped it up in stoppage time with Paqueta’s spot-kick.
Ward-Prowse is renowned for his ability from set-pieces but surely not even Moyes could have expected such an immediate impact.
Seven minutes in and from his second corner in a claret and blue shirt, Ward-Prowse swung in a cross which Aguerd nodded in unmarked at the far post.
Chelsea have now conceded a goal in each of their last 13 matches, their worst run since 1996.
But they were making inroads at the other end with Nicolas Jackson eager to get in behind West Ham’s back line.
One such run and cut-back was hacked away but when Ben Chilwell drove back in to the area, his cross was cleared by Kurt Zouma only as far as Chukwuemeka.
The 19-year-old steadied himself before lashing the loose ball past Alphonse Areola for his first Chelsea goal.
Paqueta was in the West Ham line-up despite being reportedly investigated by the Football Association for potential betting rule breaches.
The Brazil midfielder is said to be shocked by the probe, which is believed to centre around bets placed in his homeland on yellow cards awarded against him.
Paqueta did pick up a first-half booking for dissent after complaining about the award of a corner, but moments later he was inches away from scoring, dragging the ball down in a crowded penalty area only to clip a post.
Chelsea were gifted the chance to go ahead before half-time after Tomas Soucek tripped Raheem Sterling in the area, but Fernandez’s penalty was saved by Areola.
Instead Antonio fired West Ham back into the lead eight minutes into the second half when he raced on to Ward-Prowse’s cute ball over the top.
Pochettino turned to Chelsea’s latest record signing, Moises Caicedo, for his debut on the hour mark, the Ecuadorian immediately sending a long-range shot wide.
West Ham were then reduced to 10 in the 68th minute after Aguerd was shown a second yellow card for needlessly fouling Jackson.
But Chelsea, it seemed, had run out of ideas and could only muster a deflected Noni Madueke shot which was tipped wide by Areola.
And the away fans left en masse even before Paqueta rubber-stamped the victory from the spot after Caicedo fouled Emerson Palmieri.
Postecoglou: Spurs have a confidence problem to overcome
Ange Postecoglou says that Tottenham need to "overcome" their low confidence after suffering a 4-2 defeat to Liverpool on Sunday.
Spurs slipped to their fourth consecutive Premier League defeat, being left to bemoan their slow start as they found themselves 4-0 down by the hour mark thanks to goals from Mohamed Salah, Andrew Robertson, Cody Gakpo and Harvey Elliott.
Richarlison came off the bench to salvage some pride for Spurs, scoring one before setting up Son Heung-min for a goal on his 300th Premier League appearance.
Spurs had the opportunity to cut the gap to the top four after Aston Villa’s defeat to Brighton, but they remain seven points off a Champions League spot.
Postecoglou’s side still have a game in hand over the Villans, though he was sure that Spurs would be able to put their recent poor run behind them.
Asked if Spurs had a confidence problem, Postecoglou told Sky Sports: "Maybe in the front third there is.
"It probably is a bit of a lack of confidence, but again, that's something the guys have to work through.
"You have to find a way to overcome that because, ultimately, if you don't put pressure on the opposition in the front third after you've worked your way up there, they're going to get comfortable with their position."
Spurs have won just one of their last nine Premier League away games, failing to win any of the last five.
Despite that run extending at Anfield, Postecoglou highlighted what he thought was an improvement on their recent performances.
He continued: "Obviously a hugely disappointing outcome for us but at least we were more like ourselves today in terms of our football.
"Our last two away games at Newcastle and Chelsea, apart from the results which weren't great either, we just didn't try and play our football.
"I thought today, even in the first half, some of our football, our pressing was back to where it should be."
Roma 1-1 Juventus: Juve miss chance to close gap to second after draw with Roma
Juventus were held to a 1-1 draw at Roma on Sunday, missing the chance to close in on Milan in second place in Serie A.
Roma took the lead after 15 minutes when Romelu Lukaku found himself in the perfect position to tap in the rebound from a Bryan Cristante shot.
Bremer levelled with a header for Juventus just after the half-hour mark when Federico Chiesa picked him out inside the box from a corner.
Both sides had chances to find a winner in the final minutes, with Roma keeper Mile Svilar making a fingertip save to push Manuel Locatelli's volley over the bar.
Third-placed Juventus have 66 points, five fewer than Milan, who drew 3-3 with Genoa earlier on Sunday. Roma are fifth with 60 points.
Data Debrief: Leading from the back
Since scoring his first Serie A goal in the 2019-20 season, Bremer is the defender with the most headed goals in the Big-5 European leagues, netting 13 in total. Each of his last seven goals have been headers.
His goal was enough to earn Juventus a point today, but it means that they have drawn each of their last four in the competition - a first since February-March 2012 under Antonio Conte.
Chelsea 8-0 Bristol City: Blues rout hands Hayes perfect home send off
Guro Reiten starred as Chelsea thrashed already-relegated Bristol City 8-0 to keep their title hopes alive in the Women's Super League on Sunday.
The Norwegian scored four goals, netting the opener from the penalty spot to get Emma Hayes' last home game in charge off to the best start.
She scored the other three in the second half in just over 20 minutes, while teeing up Agnes Beever-Jones for the seventh goal with just two minutes left.
Beever-Jones got two, with Sjoeke Nusken and Niamh Charles also adding to the scoreline to eradicate the goal-difference advantage that Manchester City, who lost to Arsenal earlier on Sunday, had over them.
Chelsea move to within three points of the Citizens, with a game in hand over them, remaining in the fight to lift their fifth-consecutive league title.
Data Debrief:
Chelsea have scored eight goals in a game for the first time since December 2022 against Leicester City, a match they also won 8-0.
The Blues have scored in their last six games in the WSL, though it does not come close to their longest run of games with a goal in the competition - a run of 20 from April 2023 to February 2024.
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