Arsenal spurned the opportunity to retake first place in the Premier League as they lost 2-0 to fellow Londoners West Ham United at the Emirates on Thursday.
West Ham only had three efforts on target but Tomas Soucek gave them a halftime lead before former Arsenal defender Konstantinos Mavropanos extended the advantage after the break.
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Arsenal had more than twice as many chances but failed to take any as the visitors defended gamely.
West Ham took the lead against the run of play after 13 minutes when Soucek knocked home after a pull-back from Jarrod Bowen who looked as if he just managed to keep the ball in play.