Braedyn Crowley scored twice, including the all-important deciding goal eight minutes into injury time, inspiring his side to the win.
The 20 year-old opened the scoring in the first half before an own goal from Ruon Tongyik had the match level.
🏅🏆 pic.twitter.com/Nw3e4uL0pC — Melbourne City Youth (@MelbCityYouth) January 28, 2017
A beautiful strike from the Sky Blues Charles Lokoli-Ngoy gave Sydney the upper hand with 20 minutes remaining until Daniel Arzani found the back of the net from the penalty spot shortly after to set up an exciting finish.
The final goal came after City were awarded a penalty after a handball inside the box, with Crowley coolly converting to seal the victory.