Mounties Juniors completed their memorable run in the under-13s State Cup with a 3-2 win against Balmain & District FC in the final at Valentine Sports Park on Sunday.
The Anton Sansour-coached team led throughout the decider taking the lead inside the first 30-seconds.
Fahad Ahmad (two) and Zach Daffin (one) netted for the black and golds to complete a flawless three-month campaign.
The team, which sit second in the league, defeated Miranda Magpies (9-0), San Souci FC (4-2), Hornsby Heights (2-1), Curl Curl Youth Club (2-1) and Merrylands SFC (1-0) en route to the final.
Mounties, who were the only club to represent Southern Districts Soccer Football Association on finals day, had two teams make the final.
The Sam Orecchio-coached under-14s team lost 2-1 to Winston Hills in the decider. Trailing 2-0 with five-minutes remaining, Mitchell Petkovic scored to keep their hopes alive but they ran out of time to find a equaliser.
They defeated Arncliffe Aurora (1-0), Curl Curl Youth Club (3-0), Lake Heights JFC (3-2), Uni of Wollongong FC (3-2) and Miranda Magpies (2-1) in the state-wide competition.
Football NSW chief executive Stuart Hodge said the State Cup is one of the most "prestigious events" run by the organisation.
"Events such as these allow clubs from within our associations to test themselves against the best from around the state," he said.