Follow Mail Sport's live blog for all the latest team news, scores and updates from Stamford Bridge as Chelsea host Arsenal in Premier League action.
55'
Chelsea 2-0 Arsenal
Arsenal are going to need to start testing Sanchez more than they are, with the stopper looking a little shaky.
Martinelli picked up the ball out wide and saw an effort deflect wide.
Shortly after, Sanchez finger-tipped a searching cross away, with Gabriel sending a header wide at the near post from the corner.
52'
Chelsea 2-0 Arsenal
The home side are in cruise control now.