You also need to realize, that this is the last match as well as being the decisive match for Dortmund to win the Bundesliga title. Also, because Dortmund will be playing at home, then of course it is also a very appropriate moment for Dortmund to celebrate victory and also receive the Bundesliga trophy at Signal Iduna Park, home of Dortmund.
Playing at home will be boosting the mentality from dortmund. The fans are also ready to celebrate the win of bundesliga trophy at the same time.
Dortmund shall not make its fans feel disappointed. It's the biggest match for dortmund. The result will determine the fate from the club.
Dortmund win and it gets trophy. There's no better result than become a champion for this season.
What's more, the head to head record also shows that Mainz is not strong enough to beat Dortmund. So yes, because tomorrow is the last match of the season and also the decisive match for Dortmund will also be played at home, and so I personally am 100% sure that Dortmund will beat Mainz very well.
I will prefer to take the result from the previous meetings. It's caused by there are no lots of changes happened. Mainz are still mosly using the same squads like the previous meetings and so, i think that dortmund will be winning easily in this case.
The bundesliga trophy is in dortmund's hand right now. Three points and dortmund fans will able to celebrate it as the winner of bundesliga. I hope that dortmund will not make any mistake again.