Arsenal suffered only a second Premier League defeat of the campaign as Sean Dyche's inspired Everton marked the manager's first game in charge with a 1-0 win at Goodison Park.
James Tarkowski headed Everton in front from a corner on the hour to condemn Arteta's side to back-to-back losses and leave them looking nervously over their shoulders at Manchester City, who beat them in the FA Cup last week and face Tottenham on Sunday.
