The Queensland Bulls rookie contracted player produced one of the greatest Under-19 World Cup performances to advance Australia in the tournament and knock out arch-rivals England in a final-ball thriller.
As cricket.com.au's Sam Ferris reported, Australia was in deep trouble chasing England's total of 253 before the Norths product took charge.
Needing 40 from the final three overs after losing 5-53 chasing 253 to win, Australia looked down and out before Sully struck three sixes and a four in the 48th over to keep his side's title hopes alive.
The right-hander and No.10 Todd Murphy then peeled off eight runs in the penultimate over before taking 10 runs from the final over, with Sully clearing the in-field to secure the winning runs from the last ball of the match.
Sully finished unbeaten on 35 from 20 balls, alongside Murphy with 16 from 10 deliveries.
The win propels Australia into the Super League stage of the tournament, while England's hopes for a second 50-over World Cup in the space of nine months were dashed and will now play in the Plate play-off.
With Australia's hopes of a fourth Under-19 World Cup fading fast, Sully and Murphy set about on a rescue mission which started with Sully clobbering quick Blake Cullen over cover and twice beyond the long-on boundary for three sixes in the 48th over.
Murphy collected vital boundaries in the 49th and 50th overs to leave Australia requiring three runs to win from two balls.
From the penultimate delivery, Sully mistimed seamer Joey Evison to long-off where the fielder fumbled the ball to allow the Australian pair to pick up two runs with one ball remaining.
With the field up, Sully calmly lifted Evison over the close-in fielders to secure the improbable win.
Sully has been used with good affect as a pinch hitter on occasions for Norths and Queensland youth teams and has a reputation in Queensland Premier Grade circles for being able to clear a boundary.