Semi Ajayi was in 90 minutes action as relegation-threatened West Brom hammered Chelsea 5-2 to end the Blues 15-game unbeaten run in Premier League.
The last time Chelsea saw defeat was against Leicester (2-0) on the 19th of January. The Blues went unbeaten in 15 games until they succumbed to a heavy defeat against the Baggies at Stamford Bridge.
Christian Pulisic opened scoring in the 27th minute but just two minutes later Thiago Silva was sent off after receiving his second caution.
West Brom equalised in two minutes of added time in the first half thanks to Matheus Pereira. Pereira made it 2-1 for West Brom in the fourth minute of added time.
Callum Robinson scored the third goal for the Baggies in the 63rd minute before Mbaye Diagne made it 4-1 in the 68th minute. Chelsea pulled a goal back through Mason Mount on 71 minutes but on the dot of 90 minutes Robinson netted his second goal to end the game 5-2.
Baggies boss Sam Allardyce made history as the first coach to win away against Chelsea with three different clubs in the premier league, as he also won with Bolton and Crystal Palace.
While Thomas Tuchel has conceded five goals at home for the first time ever in his managerial career.
Meanwhile, Chelsea remain fourth in Premier League with 51 points while West Brom are still in the drop zone 19th with 21 points.