Bayern Munich striker Robert Lewandowski scored twice to help his side retain the German Super Cup with a 3-1 win over Borussia Dortmund. Lewandowski put Bayern in front shortly before half-time, before Thomas Muller added a second just after the restart. Marco Reus pulled a goal back for the hosts at Signal Iduna Park on 64 minutes. But Lewandowski restored his side's two-goal lead 10 minutes later with his 24th strike against his former club. The Poland international spent four years at Dortmund