Dortmund: Borussia Dortmund progressed to the DFB-Pokal semi-finals on a night when their players temporarily became ball boys after disgruntled fans threw dozens of tennis balls onto the pitch in Stuttgart.

Dortmund players picks up tennis balls thrown by fans to protest against football matches ticket prices during the German Cup DFB Pokal quarter-final match against VfB Stuttgart on Tuesday. Pic/AFP