Harry Kane headed his side in front with his first Old Trafford goal shortly after half-time, and within three minutes their lead was doubled as Lucas Moura directed Christian Eriksen's cross into the United net.

Moura, particularly impressive throughout, then finished things off by leaving Chris Smalling in his wake, a direct, powerful run taking him clear of the England defender before finishing past David De Gea on 84 minutes.

It was an assured and authoritative display from the visitors, who restricted United to half-chances, but Jose Mourinho will rue Romelu Lukaku's failure to put the home side into what would have been a deserved lead early on.

The Belgian had several opportunities, none better than when rounding Hugo Lloris before dragging his shot wide from an angle with an open net to aim at as United began the game firmly on the front foot.

Soon after, Spurs ought to have been given a penalty when Moura was barged over by Phil Jones, who later went off injured, but they were perhaps still content to go in level at the break.

The second half was an altogether different story, though, as Kane found space to loop a header into the far corner before Moura struck twice to maintain Spurs' perfect start to the season, and inflict back-to-back defeats on United.