Ocean Grove sealed a finals spot with a hard-fought 21-point victory over Drysdale on Saturday.
With one round left to play before finals, the five is set.
Minor premiers Torquay will have a week off while Modewarre and Barwon Heads will clash in a qualifying finals and Ocean Grove and Anglesea will meet in an elimination final.
The loss means Drysdale cannot make the finals even if it upsets Modda this Saturday.
Ocean Grove and Drysdale played out an even first term with the home side leading by three points at the break.
Ocean Grove started to get on top in the second term with Logan Taylor sneaking forward to goal and James Paterson threatening up forward.
The Grubbers kept the momentum going in the third term to lead by 26 points, but Drysdale kept fighting and still had a chance of causing an upset.
Both sides kicked two goals each in the final term with Ocean Grove in front by 21 when the final siren sounded.
Paterson kicked four goals for the victors and Jake Hargreaves three for the Hawks.
Ocean Grove meets Anglesea this weekend and will then play the Seas again a week later in the finals.
Drysdale finishes its season with a home match against Modewarre.
An inaccurate Barwon Heads sealed the double chance with a 69-point win against Newcomb.
The Seagulls were never threatened with Brock Close recovering from a hamstring injury to be best afield.
Modewarre also clinched the double chance with an expected win against Queenscliff.
An eight-goal third term blew the game open with Tom Worpel and Tom Hornsey each snagging four majors.
Unbeaten Torquay totally demolished Portarlington by 248 points.
The Demons could only muster one goal for the afternoon as the flag favourites ran amok with Lucas Anderson bagging 13 goals and Paul McMahon 10.
ROUND 18, August 7
Barwon Heads vs Portarlington at Howard Harmer Oval, Barwon Heads
Geelong Amateur vs Newcombb at KFC Oval, Highton
Drysdale vs Modewarre at Mortimer Oval, Drysdale
Queenscliff vs Torquay at Queenscliff Recreation Reserve
Ocean Grove vs Anglesea at Ray Menzies Oval, Ocean Grove
