Japan international Shinji Kagawa sparkled on his return to Borussia Dortmund, scoring one goal for the Ruhr Valley club and helping set up another in a 3-1 win over Freiburg on Saturday.
Champions Bayern Munich beat VfB Stuttgart 2-0, with Frenchman Franck Ribery scoring on his season debut as they prepare for their Champions League match against Man City next week.
The 25-year-old Kagawa, who had spent two seasons at Manchester United after winning consecutive Bundesliga titles in 2011 and 2012 with Dortmund, was welcomed back with roaring applause and he instantly rewarded the fans.
Freiburg scored a late consolation goal with Oliver Sorg.
Dortmund have six points from three games, one behind Bayern who never hit top form against Stuttgart.
