Werder Bremen's United States forward Josh Sargent scored the winner as his struggling side rallied past Eintracht Frankfurt.
Midfielder Amin Younes scored a superb goal and helped with another as Eintracht Frankfurt beat leaders Bayern Munich 2-1 on Saturday.
Eintracht Frankfurt stretched their unbeaten Bundelsiga streak to 10 games and broke into the top four following a 2-0 win over Cologne.
Filip Kostic scored once and set up another two goals to guide Eintracht Frankfurt to a 3-1 victory at Hoffenheim on Sunday as their third straight
Luka Jovic has returned to Eintracht Frankfurt on a six-month loan deal from Real Madrid, the clubs have announced.
"We will not start chasing our players and ask them whether their wives are barbers," a Union Berlin spokesperson said.
Moussa Diaby scored twice as 10-man Bayer Leverkusen came from a goal down to defeat in-form Eintracht Frankfurt 4-1 in the DFB Pokal second round.
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