Two goals in five minutes at the end of the first half saw the north London derby go Arsenal's way on Saturday.
A touch of fortune went against us with both goals but we weren't at our best at the Emirates.
The game started in typical derby style, all hustle and bustle, few chances and Arsenal's goals actually came after our best spell.
Christian Eriksen hit the post and Harry Kane forced Petr Cech to save at full stretch just after the half-hour but 10 minutes later, we were 2-0 down.
The first goal came from a debated free-kick against Davinson Sanchez on Alexis Sanchez on 37 minutes. Mezut Ozil curled in the set-piece and Shkodran Mustafi headed across Hugo Lloris and home.
Five minutes later and we were facing an uphill task. Arsenal had got in a couple of times down our right and made no mistake at the third time of asking. Alexandre Lacazette might have been a shade off-side when he broke clear, but his cross to the near post was collected by Alexis Sanchez who fired into the roof of the net from the angle.
We dominated the second half in terms of possession without creating clear-cut opportunities. Kane had a sight of goal blocked by Nacho Monreal and Christian Eriksen fired over but Arsenal held firm and looked a danger on the break, Hugo Lloris forced into one-on-one saves to deny Sanchez.
A late flourish saw Eric Dier's header tipped away by Cech and Heung-Min Son volley over from 16 yards - it wasn't our day.