Centrals have put their hand up to be in the top four conversation after a 27-point win over Waroona.
Bruno Faulkner and Zac De San Miguel kicked two goals each to lead the Blues to a 12.10.82 to 8.7.55 victory.
Pinjarra were too good for Mandurah running away with a 67-point victory while Rockingham booted seven goals to nil in the opening quarter to setup a 101-point win over Halls Head.
The battle for fourth spot is on as Waroona, Centrals and Mandurah all fight for a place in the finals.
LADDER: South Mandurah 26, Rockingham 20, Pinjarra 18, Waroona 10, Centrals 10, Mandurah 10, Halls Head 2.