Dortmund - There were very few bright spots for Borussia Dortmund amidst one of the club's most difficult Hinrunde in living memory. One small ray of hope for the Signal Iduna Park faithful, however, has been the form of goalkeeper Mitchell Langerak, who established himself as Jürgen Klopp’s number one in inauspicious circumstances, but has vindicated his manager's trust time and again.