Christian Eriksen scored twice as Tottenham maintained their challenge for a top-four finish and deepened Sunderland’s relegation worries.
Patrick van Aanholt gave the Black Cats the lead against the run of play but Eriksen levelled as Lee Cattermole failed to clear on the goalline.
Mousa Dembele fired Spurs ahead before Eriksen’s 25-yard shot deflected in off Sunderland debutant Jan Kirchhoff.
Harry Kane converted a penalty after Kirchhoff fouled Danny Rose.
Tottenham move a point behind third-placed Manchester City, before Manuel Pellegrini’s side play Crystal Palace at 15:00 GMT, while Sunderland remain in the drop zone.