Thiis was a game that started and pretty much finished with an injudicious back pass, a bad first touch and, as a consequence, a goal.
The pass, in the fifth minute, was from Luke Ayling, the touch was from his goalkeeper Illan Meslier and the goal, snapping in on to the mistake, was from Eddie Nketiah from Arsenal.
It was really was that simple for Arsenal and it was really was that disastrous for Leeds.
MATCH FACTS AND PREMIER LEAGUE TABLE
ARSENAL: (4-3-3-): Ramsdale 6; Soares 6, Holding 7, Gabriel 7, Tomiyasu 6; Odegaard 7, Elneny 7, Xhaka 6.