Borussia Dortmund cut the gap to Bundesliga leaders Bayern Munich with a 3-0 win at Union Berlin on Sunday. Dortmund are now six points behind Bayern, who were thrashed 4-2 by Bochum on Saturday. Captain Marco Reus broke the deadlock as he fired a shot between Andreas Luthe’s legs and secured a brace still in the first half after recovering a lost ball in the midfield. When Union were trying to come back into the game after the break, Raphaël Guerreiro crushed their hopes and sealed the win. Kevin Möhwald seemed to have pulled one back for Union with some 15 minutes left but the potential life…