Arsenal have won plenty of plaudits for their attacking play against Chelsea but I was so impressed with how sound they were defensively.
Their centre backs have been too easily bullied in recent years by Didier Drogba and Diego Costa. On Saturday afternoon, Shkodran Mustafi wasn't having any of it.
He showed so much quality alongside Laurent Koscielny and for the first time in a long time it looks like Arsenal have found a great centre-back partnership.
The pair are both quick and good in the air.