Leaders Union Berlin went two points clear at the top of the Bundesliga on Sunday after Paul Jaeckel sealed a 1-0 win at VfB Stuttgart. Second-placed Freiburg were held 2-2 at troubled Hertha Berlin. Champions Bayern Munich had missed the chance to move top temporarily on Saturday when they conceded a stoppage-time equalizer in a 2-2 draw at Borussia Dortmund. Freiburg travel to third-placed Bayern next Sunday while Union host fourth-placed Dortmund, who like Bayern are are four points adrift of the leaders. Borussia Mönchengladbach earlier triumphed 5-2 over Cologne in the Rhine derby after v…