A career-best spell by Byron Perrin lifted Spring Gully to victory over fellow EVCA premiership contender Emu Creek.
After making a crucial 29 not out the previous week with the bat, Perrin did the damage with the ball on Saturday as the Crows defended a score of 160.
Emu Creek was in a solid position at 2-69, but the Emus fell away badly, losing their final eight wickets for just 59 runs.
Perrin took six of the final eight wickets in an inspired 13-over spell.
The medium-pacer finished with figures of 13 overs, six maidens, 6-19.
Extras led the scoring for the Emus on 31, while Julian Lake (29) and Torin Petrie (20) were the only batsman to score more than 15.
Spring Gully and Emu Creek look likely to meet again in a semi-final next month. The Emus could potentially add star duo Jeremy Brown and Tyrone Downie to their squad.
While the Crows and Emus will probably meet in one semi-final, Sedgwick's opponent in the other semi-final remains unknown.
Mandurang moved back into fourth place on percentage with one round to play after disposing of West Bendigo on Saturday.
Mandurang gave its percentage a handy boost by making 307 in reply to West Bendigo's 166.
Phil Berry finished five runs short of a well-deserved century when he fell for 95.
Shaun Candy (51 not out) and Sean Rashleigh (50) added half-centuries in the big total.
Every run and wicket will be crucial in the final round, with United only .40 per cent behind Mandurang.
United plays West Bendigo in the final round, while Mandurang tackles Maiden Gully.
United kept its finals hopes alive by defeating Marong by 42 runs at Ewing Park.
After making 259 with with the bat, the Tigers bowled Marong out for 217.
Skipper Harry Whittle (3-61) and youngster James Smith (2-49) led the way with the ball in an impressive team bowling performance.
Marong's top six batsmen all made starts, but none pushed on to make a big swcore.
Richard Murphy top scored with 33 off 36 balls.
Mathematically, Marong and Maiden Gully could still make the finals, but they need a lot to go their way.
Maiden Gully denied California Gully its first win of the season on Saturday.
California Gully couldn't back up its good bowling performance and finished 53 runs short of Maiden Gully's total of 173.
Maiden Gully had four bowlers - Rob Brown, Glen Oliver, Leon Beatty and Alex Gorrie - take multiple wickets.
Brad Olson's 23 was the best performance with the bat for California Gully.
Ladder going into the final round:
Spring Gully 108
Emu Creek 104
Maiden Gully 54
West Bendigo 24
California Gully 0
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