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Mainz is going to face Dortmund in the next match. Although Dortmund is one of the renowned teams in the Bundesliga, Dortmund's performance has been weak this season. The team is not even able to make it to the top 10 of the points table. Dortmund has even lost in the last two matches. Dortmund is most likely to lose points against Mainz. The match will be a draw, the new Mainz will win.
Oh, I didn't know about the fixture thanks. Mainz beat them home earlier but Dortmund's red card made things easier. This time I wonder what happens... Dortmund are still in a downfall in the Bundesliga though. Maybe I might make a bet favouring Mainz or so.

Here's how bookmakers see their odds at the moment:
Eintracht Frankfurt - 1.40
Fsv Mainz - 1.91
Rb Leipzig - 2.63
Sport-Club Freiburg - 4.00
Vfb Stuttgart - 8.00
In fact, they are the favorites along with Eintracht. Another thing is that in the Bundesliga it is normal for someone to suddenly take off, but then fall just as hard. Literally last season, Union played in the Champions League, and they miraculously avoided relegation. But maybe with the new Champions League format, Mainz's chances there will be slightly more than "getting a few defeats and ending their participation in the tournament."
Frankfurt's being favoured the most isn't surprising. They have proven their capability over the years. But for Mainz? This is new for them. Teams like Leipzig and Dortmund are also helping others find these chances with their bad forms. Especially Dortmund of course.
About falling just as hard, Mainz haven't still fallen though.

This is what makes the situation more interesting but let's see...