A late double from Jorginho and Tammy Abraham handed Chelsea a vital win as the visitors came from behind to snatch victory from Arsenal at the Emirates Stadium.
In a feisty affair in which referee Craig Pawson brandished the yellow card on a number of occasions, Aubameyang nodded Arsenal into the lead from close range in the opening 13 minutes.
The hosts dominated the first half, forcing Chelsea boss Frank Lampard to tweak his three at the back formation. The visitors came on strong in the second half and made the all-important breakthrough when Leno failed to clear and Jorginho tapped home into an open net.
Moments later Chelsea found the net again when a counter-attacking move was finished by Tammy Abraham to send the away fans into bedlam and hand the visitors the win.