Benitez again loses out to Mourinho.
Newcastle boss Rafael Benitez was aiming to become the first manager to beat United in the league at Old Trafford with three different clubs.
But the Spaniard, who oversaw wins with Liverpool and Chelsea, was left to reflect on a sixth top-flight defeat against a team managed by Mourinho.
There was a cold handshake before kick-off between the two managers - who have both had spells in charge at Real Madrid, Inter Milan and Chelsea.
Yet there was no doubting who emerged triumphant in the battle of the tactics, with Mourinho able to send on Ibrahimovic for his first run-out since 20 April safe in the knowledge that the points were already won.