Luis Diaz headed the reds opener before curling a delicious pacy shot past Onana to give the reds the 2-0 half time lead.
Second half, more domination, but only the one goal further to show for their efforts - who else but Mo Salah. Fifteen goals now scored against Man United - ten of them at Old Trafford.
New United centre-half Mathijs de Ligt was lucky to stay on the pitch after a lunge at Luis Diaz - he was replaced by Harry Maguire to prevent an escalation after receiving a yellow card.
It's early days into his reign, but it looks like our reds have the Dutch master in the managers seat.
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