Mikel Arteta is chasing down a top-four spot and his side are level on points with Tottenham on 57. But the manner of the victory will be huge for the north London side after losing three on the bounce and returning to form in the best way possible.
As for Chelsea, this is another worrying collapse following their last Premier League game at home that ended 4-1 to Brentford.One of the guilty parties was Azpilicueta, who scored on the night but gave away a needless penalty when he inexplicably hauled Bukayo Saka down in the box.
The 20-year-old picked up the ball and slotted past Edouard Mendy late on to make it four and put the game out of Chelsea's grasp.And at full-time, Azpilicueta went straight to one section of the crowd and appeared to get into an argument with fans.
While one supporter held his hands up and clapped the Blues captain, the Spaniard did not let go.Speaking after the game, manager Thomas Tuchel was quizzed on his captain's reaction at Stamford Bridge.
Read more on dailystar.co.uk