Robert Lewandowski scored twice as Bayern Munich moved back top of the Bundesliga on Friday after coming from an early goal down to win 3-1 at Mainz.

It puts the onus back on surprise-package RB Leipzig, who drop to second on goal difference but can reclaim top spot on Saturday with a draw or victory at home to mid-table Schalke.

German champions Bayern looked back to their best after a poor run by their high standards that saw them lose at Borussia Dortmund and then Russia's Rostov in the Champions League.

They got back on track by beating Bayer Leverkusen 2-1 last weekend and were good value for the three points at Mainz, who stunned the Bavarians last season on Bayern's way to the Bundesliga title.