The last time Mainz made such a strong start to the season was two years ago, when they ended up fifth, earning a place in the Europa League.
They are not going to get carried away with their current winning streak, but will be confident when they take to the field at the Niedersachsenstadion.
"We have the necessary respect which we have ahead of every Bundesliga game and of course we have the belief that we can play another good match," said coach Thomas Tuchel.
"We still have room for improvement and, week by week, we will try to reach our absolute optimum.
"My team is showing great unity, a great deal of desire and huge ambition in view of the results we've picked up."
Win, lose or draw, Tuchel knows there is another pressing issue to address this weekend with the transfer window closing on Monday.
Mainz's main focus will be keeping hold of Nicolai Muller.
The Bundesliga's top scorer and Germany international is attracting plenty of attention after making a blistering start to the season but Tuchel is not expecting him or anybody else to leave.
"Right now, it doesn't look like anybody is leaving," Tuchel said. "But it can never be ruled out that something will happen. But we're relaxed about it and not under much pressure."
Hannover have also made an encouraging start with two wins from three, including a 2-1 success over Schalke last weekend.