Regarding the game between Dortmund and Mainz, I saw the odds for Mainz as worth taking the risk. We have a 15.25 rate for winning Mainz in this game which is really tempting for me, Dortmund lost many points this season and if they lose this game it's not surprising even if they need the full three points to win the league.
I don't think mainz will manage to win this match, Dortmund with surely put all their efforts to win the trophy and they will try to score many goals, i believe the worst scenario for Dortmund will be a draw but 95% Dortmund will easily win this match