Union Berlin will obviously have to win this match against Dortmund. Unless they do so, they are at risk of losing the first place on the table.
Now my prediction is that Bayern Munich is likely to win against Freiburg and Union Berlin is almost certain to lose against Dortmund.
The result will put Bayern Munich in second place and Dortmund in third. But Union Berlin is still expected to be at the top.
The difference is going to be that they will face a lot more competition and pressure from both Bayern Munich and Dortmund.
But if Freiburg wins the match against Bayern Munich, they will take over the lead(1st place) if Union Berlin loses

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These are going to be the most significant two matches for all four teams in my opinion.
Wow, top clubs are fighting each other in week 10, Bayern Munich vs Freiburg and Union Berlin vs Borussia Dortmund. The results of these two matches greatly affect the position in the top four list, the match against Freiburg is very important to be won by Munich because this is a good moment for them to climb up to second place, while Bayern Munich hopes that the other Big Match match Union Berlin vs Borussia Dortmund gets a draw so that their distance with Union Berlin to be 2 points.