Mikel Arteta's men travelled to hostile territory knowing that victory would see them build up a four-point lead over Manchester City before their title rivals took to the field against Nottingham Forest a couple of hours later.
The Gunners had eased to a 2-0 success on Tottenham's turf last year, but they were held to a 2-2 draw on home soil in September and had never previously won back-to-back away North London derbies in the Premier League era.
An emphatic triumph appeared to be on the cards after a gripping first half, though, as Pierre-Emile Hojbjerg's own goal, Saka's finish and Kai Havertz's header saw the visitors head into the break three goals to the good.
Arteta's side had survived several scares in the first half, though, and their magnificent run of six straight clean sheets on the road came to an end when David Raya played a mishit pass straight to Cristian Romero, who accepted that gift with a calm finish into the bottom corner.
Saka equals 30-year-old Arsenal North London derby recordDeclan Rice's foul on Ben Davies then allowed Son Heung-min to cut the deficit down to one in the dying embers, but Tottenham would fall short of completing a tremendous turnaround as Arsenal extended their lead at the top.
Saka's composed finish into the bottom corner marked his 15th goal of a productive Premier League season, and in doing so, the 22-year-old emulated two of Wright's achievements during his compatriot's Arsenal heyday.
Saka is now the first English Gunners player to hit 15 goals in one Premier League season since Wright
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