Petra Wimbersky scored two goals for Turbine, which will meet FFC Frankfurt in the May 29 final in Berlin.
Augustyniak had played in midfield in her first three matches for Turbine. Her twin sister, Julie, came on as a second-half substitute for the third straight game.
There was only one Frauen-Bundelisliga game scheduled this weekend, with FFC Frankfurt edging FFC Heike Rheine, 3-2, to trim Turbine's lead to two points.
GERMANY (German Cup semifinals)
* Nancy Augustyniak (FFC Turbine Potsdam, D1), at FFC Brauweiler Pulheim 2000, 3-0.
90 minutes at left back.
Season league stats: 3 games, 0 goals.
Season cup stats: 1 games, 0 goals.
* Julie Augustyniak (FFC Turbine Potsdam, D1), at at FFC Brauweiler Pulheim 2000, 3-0.
83rd-minute substitute for right back Maria Makowska.
Season league stats: 2 game, 1 goals.
Season cup stats: 1 game, 0 goals.