Robert Lewandowski scored a hat-trick to kick-start the new season on a high. Franck Ribery, Philip Lahm and Xabi Alonso were the other three scorers.
It was a cakewalk for the defending champions as they ran riot over the Bremen defense. Ancelotti's men were completely class apart on the night.
In another match, Bayern's closest rival, Borussia Dortmund defeated FC Mainz 2-1 to begin their season on a high.
Thomas Tuchel's side clinched full three points thanks to Pierre-Emerick Aubameyang brace. The Gabon international, who was revelation last season started exactly from where he had ended last season.
Here is a synopsis of all the 9 matches on gameweek 1
Bayern Munich 6-0 Werder Bremen
Hamburger SV 1-1 Ingolstadt
Eintracht 1-0 Schalke 04
1. FC Koln 2-0 Darmstadt 98
FC Augsburg 0-2 Wolfsburg
Borussia Dortmund 2-1 FC Mainz
Borussia Monchengladbach 2-1 Bayer Leverkusen
Hertha BSC 2-1 SC Freiburg
Hoffenheim 2-2 RB Leipzig
Team of the Week
Goalkeeper: Manuel Neuer
Defenders: Phillip Lahm, Marc Bartra, Ricardo Rodriguez
Midfielders: Xabi Alonso, Andre Schurrle, Ousmane Dembele, Thomas Muller, Franck Ribery
Striker: Robert Lewandowski