Bayern Munich retained their two-point lead at the top of the Bundesliga with a 3-1 victory against Mainz 05 on Saturday as champions Borussia Dortmund kept up the chase with a 3-0 win over Bayer Leverkusen. Goals from Mario Mandzukic and Bastian Schweinsteiger after 13 minutes looked to have put hosts Bayern in an unassailable position but an Adam Szalai penalty on the hour set the stage for a tricky finale. Bayern were without wingers Franck Ribery and Arjen Robben who have minor injuries. Coach Jupp Heynckes initially left 40 million euro ($52.6 million) signing Javi Martinez on the bench again at the start.