West Ham has now beaten Chelsea, Liverpool and Tottenham in the Premier League this season.
They have also knocked both Manchester sides out of the League Cup.
Chelsea suffered their second Premier League defeat of the season as West Ham staged the thrilling comeback at the London Stadium.
West Ham boss David Moyes admits his side can play better after Hammers consolidate fourth spot
Chelsea paid the price for an error-strewn performance as goalkeeper Edouard Mendy was at fault for two of West Ham’s three goals, including Arthur Masuaku’s freakish winner.
“I didn’t see our performance dip against Manchester United or today, it was enough to win the game,” Tuchel said
“We gave easy goals away, this is unusual – big mistakes that lead to big chances and easy goals. We’ve done this against United, Watford, and today.
We are not good enough in the details at the moment. This is a game about details, I can only repeat myself. Without doing big mistakes, there’s a big chance we win this game.
As for whether Masuaku’s winner was intended, Moyes added:
“It was a great cross! We have to praise him for that, you have to get the ball in the box.
“It was a bit of a lucky goal, but you have to take what you get in football, and today we got that goal which made it 3-2.”
