Stuttgart's poor run of form continued as they lost 3-1 to RB Leipzig, who consolidated fourth place in the Bundesliga.
Borussia Dortmund blew a 3-0 lead at home to Hoffenheim to draw 3-3 and see their Bundesliga lead cut to five points.
Bayern Munich crashed to a shock 3-1 defeat at Bayer Leverkusen on Saturday, while Borussia Dortmund drew with Frankfurt.
Fulham have signed Hoffenheim's Havard Nordtveit on loan until the end of the season.
Borussia Dortmund opened a nine-point lead over Bayern Munich at the top of the Bundesliga table with a 5-1 rout of strugglers Hanover on Saturday.
Defending champions Bayern Munich got the Bundesliga back underway with a 3-1 win at Hoffenheim on Friday.
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