Two goals from Son Heung-min and Harry Kane and one apiece for Tanguy Ndombele and Serge Aurier saw 10-man United sink without trace as the inquiries begin into their shambolic showing
Tottenham came from behind to inflict a damaging defeat on Man Utd after a frantic first-half of football which had everything.
Jose Mourinho’s return to Old Trafford looked to have got off to the worst possible start as Bruno Fernandes tucked away a penalty inside two minutes.
But Spurs hit back immediately through Tanguy Ndombele and Son Heung-min to reverse the deficit, before Anthony Martial was sent off for a heated tangle with Erik Lamela.
Harry Kane and Son then furthered Tottenham’s lead as United began to sink without trace, undone largely by their own shoddy defending.
Ole Gunnar Solskjaer looked to shut up shop at the break, but to no avail, as Serge Aurier added a fifth before the hour, before Paul Pogba gave away a careless penalty, which Kane duly converted to compile United’s misery.