Although in some recent matches that Union Berlin got better results compared to Leipzig but still, their position in the standings is very far apart. because yes, Leipzig is in the upper zone and Union Berlin is in the lower zone and moreover, Leipzig also plays at home. Of course, with these factors, Leipzig still has a good chance of winning.
But to be honest, beating Leipzig at home remains a difficult mission for Union Berlin in this match.
I agree , to beat Leipzig at home it needs a few good things on your side and for sure some luck.
At the moment it dosnt look very good for Union Berlin as they are behind with 2 scored goals from Leipzig.
The statistics also looks very good for Leipzig , if no surprise will be happen it should be 3 points for the Home team.