Shinji Kagawa made a dream return to Dortmund, scoring on his second debut for the club in a 3-1 win over Freiburg.
Full-back Sascha Riether has his sights set on coaching when he retires, but plans to see out his career with Freiburg.
Freiburg and Borussia Monchengladbach were both left waiting for their first win of the season after a 0-0 draw on Sunday.
Bayern Munich were held to a 1-1 draw by Schalke, while Bayer Leverkusen ran out 4-2 winners against Hertha Berlin.
Cedric Bakambu will have the choice of joining either Swansea City or Freiburg with offers from both clubs on the table.
Bayer Leverkusen claimed a shock 2-0 Bundesliga win at Borussia Dortmund on Saturday, while Hannover beat Schalke.
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