Spurs started without wingers. Lennon is injured and Bale played through the centre. City scored an early goal through Nasri.
After an hour, Spurs took off Gylfi Sigurdsson and Scott Parker for Lewis Holtby and Tom Huddlestone. Then Jermain Defoe came on in place of Emmanuel Adebayor.
With Bale playing wide, Spurs promptly turned the tables on City, scoring goals by Dempsey, Defoe and, inevitably, Bale.
So Spurs remain in the race for fourth place. Manchester City have shown themselves to be fallible. And Manchester United will now be crowned Champions if they beat Aston Villa on Monday night.