Manchester United produced one of their best performances under Jose Mourinho against West Ham on Wednesday night.
With a place in the EFL Cup semi-finals at stake, the Red Devils turned on the style and ran riot at Old Trafford, thrashing their opponents 4-1.
Zlatan Ibrahimovic opened the scoring from Henrikh Mkhitaryan's beautiful back-heeled assist before second-half strikes from Anthony Martial.
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A second for Ibrahimovic in the 93rd minute secured an impressive victory for United, who face Hull City on January 10 in the last four.
For all the hosts' dominance, though, West Ham were ultimately the masters of their own demise.
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The Hammers were guilty of making a number of defensive errors, with Dimitri Payet's mistake in the build-up to Martial's first goal in the 48th minute proving the most costly.
A rare misplaced pass from the Frenchman gifted possession back to United in a dangerous area, at which point he should have bust a gut to win the ball back.
And yet, inexplicably, Payet stood still as Antonio Valencia played Mkhitaryan through on goal, the Armenian squaring for Martial to fire home.
See below for Payet's demonstration of how not to defend after giving the ball away.
Credit where it's due, Valencia's back-heel pass to Mkhitaryan was delightful, but Payet should have made more of an effort to stop it.
The 29-year-old could have either shut Valencia down or marked Mkhitaryan tighter, but he did neither and allowed the latter to burst through West Ham's defensive line.
A wizard going forward, Payet clearly doesn't know how to defend.
Manager Slaven Bilic was visibly underwhelmed by his side's performance following the game, telling Sky Sports: "I'm very disappointed, they deserved it.
"You can't have a slow start anywhere, especially not here because they're good anyway, but when they're one up they hit on the counter attack, have amazing quality and are very direct and punish you.
"They could've scored a second one after the first but we defended and then came back into it. At half-time we said we couldn't allow them to do it again but it was exactly the same start in the second half.
"It's hard to come back twice and then they scored the third one and that's them totally in control of the game. You can't expect anything here when you have such a slow start to the game.
"I can't put my finger on [why we were different to Sunday], but definitely we were lacking because we played two games in three or four days. It was totally different."