Whites boss Jesse Marsch witnessed a cataclysm of errors in the opening 24 minutes.
Former loanee Eddie Nketiah pounced on a loose touch from goalkeeper Illan Meslier to open proceedings in the fifth minute before he doubled his and the Gunners’ advantage five minutes later, firing home after good work from Bukayo Saka.
And then catastrophe struck as captain for the day Luke Ayling saw red for a rash and needless challenge on Gabriel Martinelli, leaving the Yorkshiremen with ten men for the remainder of the game.
The visitors scrambled a goal back through Diego Llorente but the damage had already been done.
Leeds applied plenty of late pressure but their end product faltered in the final third, as it has done for the majority of the season. One fine example of that was Jack Harrison, who dropped yet another stinker of a display.
After hitting some form, the 25-year-old’s woes returned as it’s now three straight league games without a goal or assist to his name.
It was a similar story down at the Emirates Stadium. Besides the sent-off right-back, Harrison was SofaScore’s lowest-rated player in the match (5.8). From 48 touches across the 90 minutes, he lost possession a whopping match-high 24 times – once every other touch.
Again, he struggled to deliver an accurate cross from three attempts, didn’t fire a single shot at goal and made only 57% of his 23 passing attempts, which is pretty abysmal, so it’s no wonder the Whites couldn’t salvage something late on even with the one-man disadvantage.
The winger also won only eight of his 18 duels (44%).
Lacking end product, Harrison was one of many Leeds stars to drop a nightmare-like display in the capital on Sunday afternoon. He’ll need to vastly improve if he’s to turn their attacking fortunes around ahead of another tricky encounter, hosting Chelsea in midweek.