Australian goalkeeper Mitch Langerak has starred for Borussia Dortmund as they downed Bayern Munich in the German Cup semi-final, saving a penalty in a high-pressure shoot-out.

The 26-year-old from Queensland kept the Bundesliga champions scoreless from the spot at Munich’s Allianz Arena on Tuesday night to help Dortmund win 2-0 on penalties.

Robert Lewandowski drew first blood against his former employers to give Bayern a first-half lead, before Dortmund striker Pierre-Emerick Aubameyang equalised 15 minutes from time.

Langerak more than justified keeping his spot in Dortmund’s line-up after Germany international Roman Weidenfeller was ruled out with a pelvis injury.

With the score deadlocked 1-1 after extra-time, the gloveman took his place between the sticks, diving to his right to stop a Mario Goetze shot after both Philipp Lahm and Xabi Alonso astonishingly slipped over in their attempts.

Langerak’s effort was enough, as Bayern goalkeeper Manuel Neuer flicked Bayern’s crucial fourth spot-kick against the crossbar to send coach Jurgen Klopp’s men through to their third Cup final in four years in his last season at the helm.

Dortmund will face either VfL Wolfsburg or third-division leaders Arminia Bielefeld, who meet in Wednesday’s other semi-final.

Tuesday’s showdown was a repeat of both the 2012 and 2014 German Cup finals in Berlin.

When Dortmund routed Bayern 5-2 three years ago, Langerak came off the bench early on after a Weidenfeller injury.

Pep Guardiola’s Bayern took revenge with a 2-0 extra-time victory in Berlin last year as they won the league and cup double.

With six caps for the Socceroos as Mat Ryan’s understudy, Langerak has played in six Bundesliga matches, four German Cup games and a single Champions League match this season.