Arsenal were beaten 3-1 as they crashed out of the FA Cup at the hands of a rampant Manchester United, who are now on an eight-game winning run under new boss Ole Gunnar Solskjaer.
Despite some United fans criticising the Norwegian for his team selection, former Gunner Alexis Sanchez returned to haunt his former employers.
The Chilean was played through by a sumptuous pass by Romelu Lukaku and his chipped finish found the inside of the far post after he outwitted Petr Cech.
It was soon 2-0 as Jesse Lingard controlled a Lukaku pass in the inside of the Arsenal 18-yard box and slotted home.
Arsenal ensured they were not out of it just before the break, though.
Aaron Ramsey broke into the area, squared the across goal and Pierre-Emerick Aubameyang could not miss from under the bar.
Having already lost Sokratis Papastathopoulos to injury, the hosts suffered a blow when captain Laurent Koscielny was forced to depart the action after an awkward tangle with Lukaku left him bloodied and with a suspected broken jaw.
The Gunners pushed for an equaliser, with Sergio Romero producing a stunning save from Ramsey.
However, the home side left space at the back and – with substitutes Marcus Rashford and Anthony Martial giving United a fresh lease of life – the visitors used their pace on the break to wrap the game up.
Paul Pogba’s driving run gave him time and space to shoot and when Cech could only parry the ball out, Martial tapped home.
There were ugly scenes at the end of the game as a scuffle between Rashford and Kolasinac threatened to boil over when a fan appeared to throw a coin into the melee of players.
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