The victory means the lads can now top Group One of the competition and qualify for the end-of-season play-offs.
The pressure was on as defeat would have ruled the team out of the running for top spot.
But the players delivered thanks to two bursts of three goals in 10-minute spells in each half at Sunderland's Academy of Light.
Victor Zapata-Caicedo struck on 24 and 31 minutes before Roman Michael-Percil made it 3-1 on 34.
Sunderland responded to make it 3-2 at half-time but then three more goals from Dominic Ball (63 minutes), Ruben Lameiras (68) and Darren McQueen (73) secured the win.
The three points meant the team leapfrogged over Sunderland into top spot on 21 points with one more group fixture remaining.
And they won't have to wait for long - the squad travels from Sunderland straight to West Brom to complete their Group One campaign in a noon kick-off on Saturday (April 27).
Another victory will take them onto 24 points. That will take them beyond reach of Sunderland, who have one game remaining against Liverpool.
The Anfield side can also still reach 24 points with three matches remaining, all away against West Ham on Saturday, Stoke on Monday and then Sunderland on May 4.
However, after Friday's result, we have a 10-goal better goal difference than the Reds.
Academy Manager, John McDermott, reported: "We've two games back-to-back as a result of going away to tournaments in Moscow and Amsterdam.
"I was really pleased with how we played and how we applied ourselves at Sunderland.
"They are a good side, started top of the group but we were strong and quite convincing in the end.
"Once again, Victor was outstanding inside and outside of the box and scored two goals. The first goal was after some great play from Roman and then scored again for 2-1, showing great physical powess.
"Roman then scored with a reflex finish and it was 3-2 at half-time. Dominic Ball scored a towering header from a corner and then substitute Darren McQueen got a good assist, closed a backpass down and that left Ruben to slot it into an empty goal from 20 yards.
"Darren completed our scoring with a clinical finish, another good team goal.
"Laste Dombaxe drove the team on from midfield, an outstanding performance as captain.
"We now travel to West Brom. We've taken a big squad for these matches and hopefully we'll come away with another positive performance and result."
Spurs U18s:McGee, A McQueen, Ball (McEneff, 76), Ogilvie, Ward (Vincent-Young, 71), Dombaxe, Lesniak, Lameiras, Michael-Percil, Miller, Zapata-Caicedo (D McQueen, 71).