Ryan Mason netted the only goal of the game on 82 minutes, finishing off a fine move by clipping beyond the advancing Costel Pantilimon.
Unfortunately he could play no further part as he was injured in the process, but despite Sunderland's Jack Rodwell hitting the crossbar we saw out the game - and could have added to our lead as we finished the stronger team.
Ex-Spur Jermain Defoe had gone closest to breaking the deadlock in the first half when he hit the base of the post.
Spurs (4-2-3-1): Lloris (c), Walker, Vertonghen, Alderweireld, Davies, Dier, Mason (Carroll 84), Son (Townsend 62), Alli (Lamela 66), Chadli, Kane. Substitutes (not used): Vorm, Rose, Trippier, Winks.
Sunderland (4-5-1): Pantilimon, Jones, Kaboul, O’Shea (c), van Aanholt, Defoe, Gomez (Cattermole 73), M’Vila, Toivonen (Rodwell 81), Lens, Borini (Watmore 73). Substitutes (not used): Mannone, Larsson, Graham, Coates.
Goals: Spurs – Mason 82.
Yellow cards: Sunderland – Borini 21, Jones 42. Tottenham - Vertonghen 17.
Referee: Craig Pawson.