Union Berlin moved back to the top of the Bundesliga on Saturday after beating Mainz 2-1, days after its bold move to sign former Real Madrid star Isco Alarcón fell apart. American forward Jordan Pefok scored late to fire Union two points clear of Bayern Munich and Borussia Dortmund. Union supporters and the team jumped up and down as the fans chanted “Take Bayern's lederhosen off,” and sung about leading the league.