Daniel Akindayini struck twice on 10 and 20 minutes to hand the lads a 2-0 lead at half-time.
Nathan Oduwa added the third with the goalscoring completed by an own goal 10 minutes from time.
Second year scholar Akindayini wasted no time in making his mark as he fired us ahead in the 10th minute and then had a stroke of luck to double the lead 12 minutes later.
Anthony Georgiou did well to get to the byline and crossed for Akindayini, unmarked on the edge of the six-yard box. He scuffed his shot but that only sent it looping up and over Middlesbrough keeper Joe Fryer and into the net.
The visitors came back into the game and went close on 24 minutes only for Kyle Walker-Peters to clear off the line, before goalkeeper Luke McGee was equal to Mark Kitching’s 20-yard effort, tipping it over the bar. Five minutes before the break, Boro were awarded a free-kick inside the penalty area but Lewis Maloney could only blast it high and wide.
We started the second period well and almost added a third with two chances inside a couple of minutes just before the hour mark. First Walker-Peters showed good skill in the area to beat his man but fired his shot straight at Fryer and shortly after Josh Onomah reached the byline and cut back for Connor Ogilvie, whose fierce drive crashed down off the underside of the crossbar on to the goal-line, but the officials ruled it didn’t go over.
Georgiou then blazed over from just inside the area before Boro had their best chance of the game, when Tom McCaloon skipped past a couple of defenders down the inside right channel and fired in a shot which beat McGee but cannoned back off the post to safety.
The crucial third goal came 20 minutes from time. Emmanuel Sonupe and Akindayini combined well to find substitute Nathan Oduwa in the area, he lifted the ball over the defender and hit a right-footed half-volley past Fryer and into the net to all but seal the win.
Oduwa was then heavily involved in our fourth on 81 minutes, collecting a delightful pass from Will Miller before racing into the area. He then rounded Fryer and slid a ball across the face of the goal which Boro defender Ross McNab could only divert into his only net, rounding off a fine start for the lads.
It was a performance which Academy Manager John McDermott described as ‘a good day at the office’.
“I was very pleased, I thought we played really well in the first half,” he added. “Middlesbrough are a top Academy side and I thought they were good today. Maybe four flattered us a little but we played well.
“We passed the ball well, defended our goal in good fashion and the clean sheet was really precious. The third goal was really important because the game had started to be quite end-to-end and if they’d scored it, it would have been interesting.
“I was really pleased with Daniel Akindayini who scored in the week and managed to keep that going today, while Christian Maghoma was making his debut for the Under-18s and had a really good game. There were lots of positives today.”
Spurs U18s: McGee, Walkes, Maghoma, Ogilvie, Walker-Peters, Lesniak, Onomah, Miller, Sonupe (Amos, 72), Georgiou (Oduwa, 60), Akindayini (Ross, 80). Substitutes (not used): Liam Priestley, Channing Campbell-Young.