VIDEO: Chelsea 2-4 Arsenal - Nketiah Scores Twice to Earn the Gunners a Win
The Gunners' hopes of securing a place in next season's Champions League had been significantly damaged by those losses but this win will provide renewed belief.
Gathogo Wanjiru Eddie Nketiah was selected ahead of out-of-sorts Alexandre Lacazette in Arsenal's attack and he rewarded manager Mikel Arteta's faith when he took advantage of Andreas Christensen's weak back pass with a composed finish.
It was the start of a chaotic first half as Timo Werner equalized with a deflected shot four minutes later before Emile Smith Rowe showed a touch of class to beat Chelsea keeper Edouard Mendy with a cool finish from the edge of the area.
Chelsea was back on terms again before the breakthrough captain Cesar Azpilicueta but Nketiah pounced on a series of defensive errors in the Blues' box to put Arsenal back in front just before the hour mark.
Bukayo Saka was outstanding for Arsenal and he got the reward his performance deserved when he sealed the win from the spot in added time after he was hauled down by Azpilicueta.
The Gunners are now level on points with north London rivals Tottenham with a derby at Emirates Stadium still to come.
