Arsenal overcame David Luiz’s dismissal against his old club to twice come from behind against Chelsea in an eventful London derby.
The Gunners looked beaten when Jorginho discharged Chelsea ahead from the penalty spot after Luiz was shown a straight red card for bundling over Tammy Abraham.
The Chelsea forward had pounced on a terrible backpass by Shkodran Mustafi and rounded keeper Bernd Leno when he was shoved over by Brazil defender Luiz.
Chelsea were dominant for long periods however failed to kill the game off and were punished once N’Golo Kante slipped inside the centre circle allowing 18-year-old Martinelli to gallop free and manufacture a wonderful finish, the Brazilian’s 10th league and cup goal of the season.
It was Arsenal’s initial shot on track and came after a Chelsea corner that was cleared by Mustafi, the German atoning for his earlier error.
Chelsea thought they’d won it when skipper Cesar Azpilicueta scored from six yards six minutes from time however spirited Arsenal attained a point through captain Hector Bellerin – making his initial appearances since five December.
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