Illawarra baseball officials have nominated Cringila Park and Fred Finch Park for Saturday's opening round of semi-finals.
Minor premiers Wests Cardinals take on premiers Dapto Chiefs in the major semi-final at Cringila Park, with the winner through to the best-of-three grand final series beginning on Saturday, September 21.
In the elimination semi-final at Eagles Field, Fred Finch Park, third-placed Northern Pirates face fourth-placed Kiama Braves with the winner to face the loser of the major semi-final.
Both first grade semi-finals are from 1.30pm, with second grade semis from 11.15am and third grade at 9am.
In second grade, Cardinals take on Pirates in the major semi-final and Chiefs face Braves in the minor semi.
In third grade, Pirates meet Cardinals in the major semi-final, while Eagles take on Braves in the minor semi.
All minor league fourth and fifth grade semi-finals are on Sunday at Fairy Meadow's Dalton Park.
A decision on the venues for Saturday week's preliminary finals will be made early next week.