Borussia Dortmund missed the chance to close the gap on Bayern Munich after a 3-1 defeat at Hamburg on Friday night.
Wolfsburg slipped 13 points behind Bundesliga leaders Bayern Munich as they were beaten 2-0 at Mainz on Saturday.
Stuttgart and Hannover both picked up valuable wins to move out of the bottom three of the Bundesliga on Sunday.
Bayern Munich set a Bundesliga record for the best start to a season with their ninth consecutive victory, a 1-0 win over Werder Bremen.
Robert Lewandowski carved his name in history with a double for Bayern Munich, while Schalke drew level with Dortmund.
Bayern Munich opened up a three-point lead at the top of the Bundesliga by beating Darmstadt 3-0.