Rockingham are minor premiers after coming from four goals down at three-quarter-time to snatch a 15-point victory over Baldivis.
The Brumbies booted five goals to the Rams two behinds in the opening term to put the home side on the back foot early.
Baldivis kicked just another two goals for the game as Rockingham piled on seven in the final quarter to claim a 9.10.64 to 7.7.49 triumph.
Mandurah climbed Centrals into fourth position after a 24-point win over Waroona and the Blues fell two-points short of Pinjarra.
Halls Head finished their season on a high by handing South Mandurah the wooden spoon defeating the Falcons by 69-points.
LADDER: Rockingham 60, Baldivis 56 (161.15%), Pinjarra 56 (138.01%), Mandurah 36 (108.62%), Centrals 36 (99.84%), Halls Head 16, Waroona 16, South Mandurah 12.
FINALS WEEK ONE: Sunday September 1.
QUALIFYING FINAL - Baldivis v Pinjarra 2:30PM Baldivis Oval
ELIMINATION FINAL - Mandurah v Centrals 2:30PM Rushton Park