It took Tottenham 11 seconds to score, and Marouane Fellaini seven minutes to be substituted, and that should tell you all you need to know.
Tottenham are in the ascendancy now, making serious ground on the top four, while Manchester United have slipped to 15 points adrift of their City rivals. If the margin of victory appears comfortable here, note it could have been more.
Tottenham were denied a clear penalty and Heung-Min Son missed the chance of the night, shooting straight at David De Gea after 69 minutes. It is fair to say Harry Kane, in a good position at the far post, was not impressed.