Rockingham and South Mandurah will meet again to decide the Peel Football League premiership.
South Mandurah were the second team into the grand final after leaving it to the last few minutes to record an eight-point victory.
The Falcons who trailed by 25-points at half-time booted seven second half goals to Pinjarra's one to score an 11.9.75 to 9.13.67 triumph.
Brodie Wemm kicked four majors for the victors while Leroy Jetta kicked three goals for the Tigers.
In earlier matches, Pinjarra breezed past South Mandurah and will meet in the reserves grand final while extra time was needed to seperate Rockingham and Pinjarra in the colts eventually the Rams succeeded and next week face Halls Head in the grand final.
2:30pm - Rockingham v South Mandurah
12:10pm - Rockingham v Pinjarra
9:35am - Halls Head v Rockingham