BERLIN, April 19 (Reuters) - Luca Toni struck twice to earn Bayern Munich a 2-1 extra-time win over Borussia Dortmund in the German Cup final on Saturday, giving the Bavarians a record 14th win in the competition and setting up a likely domestic double. Toni had scored his first in the 11th minute and Bayern were heading for a regulation victory before Mladen Petric struck in the second minute of added time to level the scores and bring heroic Dortmund back from the brink at the Olympiastadion. Bayern then struggled to keep Dortmund at bay before Toni wrongfooted Dortmund keeper Marc Ziegler in the 103rd minute to seal the win with the 35th goal of his debut season in Germany. Dortmund finished with 10 men after Jakub Blaszczykowski received a second booking in the 108th minute. Bayern hold a 10-point lead in the Bundesliga with five matches to play and should go on to complete their third league and cup double in four seasons.