BERLIN (Reuters) - Bundesliga leaders Borussia Dortmund slumped to a shock 2-1 loss at Augsburg on Friday as forward Ji Dong-won scored twice to give champions Bayern Munich the chance to draw level at the top.

Dortmund, whose captain and top scorer Marco Reus returned after a month out through injury, are on 54 points, three ahead of Bayern who travel to Borussia Moenchengladbach on Saturday.