AFP - Robert Lewandowski netted twice as Bayern Munich retained the German Super Cup with a 3-1 win at Borussia Dortmund on Tuesday in a high-tempo encounter. Dortmund captain Marco Reus pulled a goal back when he curled a superb shot inside the post before Lewandowski settled the match. New coach Julian Nagelsmann has earned a trophy, which Bayern also won last year against Dortmund in Munich, with his first win in charge. Lewandowski put Bayern ahead four minutes before the break, perfectly timing his run into the box to head home a pin-point Serge Gnabry cross. However, Lewandowski ended the tie as a contest, after Bayern capitalised on a rare mistake in the Dortmund defence.