The Robertson Spuddies claimed their maiden Group Seven premiership on Sunday, defeating the Mount Warrigal Kooris 18-10 in the third grade decider.
At Shellharbour's Ron Costello Oval, the Kooris, who have won the past three premierships, scored first when a ball toed through by centre Treigh Stewart ended in the hands of winger Bradley Berry.
This try came while both teams were reduced to 12-men, with Kooris' Dylan Riggs and Spuddies' Mitchell Conquest being sin-binned for an altercation.
Despite trialling 4-nil at the break, the Spuddies never gave up and they were rewarded for their desperate defence when centre James Foyer crossed.
Josh Heyhorn's boot then gave the Spuddies their first lead of the match 6-4.
But the premiers hit back to be 10-6 after Nikita Drew put Stewart into space before the electric back sprinted 60 metres to score.
Minutes later, the Spuds regained the lead at 12-10 when Harrison Whatman wrapped around Dylan Balaam to score.
Despite losing inspirational skipper Tom Keft to a concussion, the Spuds sealed the match when player/coach Damien Barton barged over under the sticks.
Heyhorn then made the lead eight, which they never relinquished - despite Drew and Whatman finishing the game in the bin.
Robertson fullback Jayden Valenzisi was named man of the match.
Earlier, Jamberoo edged Milton-Ulladulla 10-6 for their second consecutive women's league tag one crown, while Albion Park-Oak Flats downed Gerringong 6-4 in the WLT2 final.