Robert Lewandowski and Thomas Mueller each struck twice to hand Bayern Munich a 4-2 win over Werder Bremen on Sunday and stretch their lead at the top of the Bundesliga to a staggering 16 points. Lewandowski, who had missed Bayerns last match with a knee injury, put Bayern 2-1 ahead with a powerful header in the 63rd minute. He then grabbed another in the 76th with yet another header after Bremen had levelled with a Niklas Suele own goal.