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The jury has been out for some time, with results outpacing performances and buying him more patience, but it seems Manchester United's luck has finally run out.
Crystal Palace was the latest team to expose the horrible flaws in this Man United side.
Of course, Liverpool cannot get on a high horse about losing to Oliver Glasner's men, but Ten Hag suffered not only a defeat but also a humiliation.
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From the first minute to the last, only one team was in the ascendency.
Ten Hag's side was cut open with consummate ease, and the defensive frailties came with absolutely no pay-off in terms of at least posing some attacking threat.
In securing victory, Crystal Palace completed the double over Manchester United.
The first draw, a 0-0 at Anfield, made that painfully obvious, but it was evident in all of the meetings with Manchester United this season.
Had Liverpool been more clinical, it would have won all three matches.
Liverpool has really struggled for clean sheets, especially in the second half of the campaign, and there's a feeling that even the revamped midfield is not quite offering optimal protection to the back line.
To fix that, it may be that Slot needs an elite defensive midfielder.
If he can do the double over Manchester United next season, it will be a sure bellwether that he has got Liverpool to where it needs to be.
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