Jim Teyssier pitched a complete game shutout, striking out 9, while allowing just 3 hits and walking 2.
South Oakland scored its first run with two out in the bottom of the second, on three straight singels by Baumgartel, Smith and Gwin.
The Bulldogs left two men on base in the top of the third and would not threaten again.
In the bottom of the fourth, Fago walked, and pinch runner Tim Lipp stole second and advanced to third on a throwing error; he scored on Nick Berdine’s rbi single to left.
The Ducks will face Elliot in the finals on Saturday time and place to be determined.