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The Blues have been in excellent form since Tuchel's arrival and have been defensively solid, keeping two clean sheets against Atletico Madrid in the Champions League.
But Sam Allardyce's side absolutely tore them apart, scoring five through Matheus Pereira (two), Callum Robinson (two) and Grady Diangana. An incredible victory.
All this after Chelsea had actually taken the lead in the first half through Christian Pulisic and looked on their way to a fairly routine three points.
A red card for Thiago Silva just before the half-hour mark hampered the Blues - but what came next was still hugely unexpected.
West Brom pressed and bothered Chelsea and Pereira got the reward by scoring two just before half-time - both were excellent finishes from the Brazilian midfielder.
The Chelsea comeback simply never materialised in the second half as West Brom picked them off three more times, playing some fantastic football. Substitute Mason Mount briefly made the game 4-2, but Robinson's second late in the game put the seal on an amazing triumph for Allardyce and his players.
This game is mad. :dizzy_face: https://t.co/8C9giSXa5Q- Football on BT Sport (@btsportfootball) April 3, 2021
West Brom had looked doomed - and Chelsea headed to Champions League qualification security via the top four - going into Saturday's early kick-off. But this result turned everything on its head.
Image credit: BT Sport/Twitter
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