Wollongong beat Illawarra premiership leaders Dapto by three wickets in a game which produced just 83 runs and 17 wickets, while Keira crushed University by 68 runs in Wednesday night's semi-final double-header.

Keira skipper Graeme Batty struck an unbeaten 44 and opener Knut Willmott 33 to guide the Lions to an imposing 7-135.

Uni were never a hope in the run chase, losing 7-35 before being bowled out for 67 off 15.4 overs.

Wayne Livermore (18) top-scored with Peter Broyd taking 3-20 and Nick Bell 2-14.

In the other game, Wollongong made hard work of chasing just 41, winning with three wickets and 4.4 overs to spare.

Daniel Pahek starred with the ball for Wollongong, taking 5-18 with Dapto bowled out in 67 balls.

Wollongong reached the target of 42 in the 16th over.

Wollongong opener Adam Day (13) held the innings together, while Cam Nupier took 3-11.

The final at North Dalton Park between Wollongong and Keira will start at 7.40pm, preceded by Uni and Dapto (5pm) battling it out for third spot.

The competition featured 16 teams with the four pool winners in the semi-finals.

University won the inaugural Twenty20 in 2007, Balgownie won in 2008 and Oak Flats beat Helensburgh in the final last year.